3 Types of Packaging Prototypes: White Sample / Structural Mock-Up / Color Proof—What a Printer Should Ask First for a New Brand's Initial Sample Order
💡 💡 At a Glance
The most common confusion during a new brand's first sample order is that the client sees prototyping as one task, while the printer understands it as three different tasks. The boundaries between the three physical sample types are as follows. 1. White sample: No printing and quick assembly from ordinary white cardboard; validates only the structure, including locking tabs, insertion tabs, lid gaps, dimensions, filling efficiency, and production-line formability. It contains no color or finishing information. Its main cost is time, normally 2-3 days, and many printers provide it as a pre-sales service without charging a prototyping fee. 2. Structural mock-up: Made with materials close to the final version, including actual greyboard thickness, specialty paper, wrapping, carrying cords, magnets, and inserts. It validates opening and closing feel, tactile direction, and the relationship between the insert and product. However, because it is handmade, production consistency cannot be guaranteed. Lead time: 5-7 days. 3. Color proof: The final artwork produced on production equipment using the final materials and processes. It is the first sample to approach the production result and validates color, post-printing sequence, and overall appearance. However, a single-machine, single-batch proof and a continuous long production run inevitably differ in ink drift and paper batch. Color-sensitive categories require tolerance and reference-sample procedures to be stated in the contract. Lead time: 7-12 days. The printer should first ask three questions: what this round needs to validate, which determines the sample type; how many revision rounds are expected, with fees charged per round and structural changes preferably finalized during the white-sample stage; and who will review the sample. Internal decisions may use simpler samples, client sign-off requires a color proof with clear wording on whether the artwork or physical sample is being approved, and trade shows or photography may require an additional presentation-grade sample. The wording in the 'Scope of Approval' section determines responsibility for production color deviations.
In August 2026, a new brand making scented candles contacted us for the first time.
She brought a sample box she had cut from cardboard, containing 12 candles, and asked us: "Can this be made in bulk?"
We examined the box and said three things: "There is one structural issue, we have no idea what the color will look like, and we have no idea how the finishing will perform."
She was surprised: "Can't you determine the color just by looking at it?"
We replied: "No. All we can see is the color on your computer screen."
At that moment, we realized that her understanding of "prototyping" differed from ours. She thought prototyping meant "making something to see whether it works," while we understood it as "making a sample that validates one specific thing."
This misunderstanding repeatedly emerged over the following two weeks, and the sample went through four rounds of revision without converging. We therefore began dividing prototyping into three types on our quotations and in the first email we send to new clients.
The First Boundary: White Sample—Validate Structure Only
The white sample is the fastest, least expensive, and most frequently misunderstood type of prototype.
What it is: a complete structure made from unprinted white cardboard or greyboard, with no printing of any kind. What you can see in your hand includes the box format, dimensions, locking tabs, lid gaps, insert positions, and opening and closing action, but no color, finishing, or printing effect whatsoever.
What can it validate?
First, whether the structure works. Whether the locking tab holds, whether the lid and body interfere, whether the bottom insertion tabs provide sufficient support, and whether the format can be formed on the production line. These are the core values of a white sample, because once a structural issue is discovered during mass production, the loss affects the entire batch.
Second, whether the dimensions are correct. Whether the product fits snugly, whether it is easy to remove, and whether there is sufficient clearance between the product and the box.
Third, filling efficiency. Whether filling is manual or automated and how many seconds each box takes. Many clients overlook this factor, but it is part of the cost structure.
What it cannot validate: color, finishing, material appearance, strength, compression resistance, or stacking.
A client said: "I have seen the white sample, so the color should be fine, right?"
We replied: "The white sample contains no color information. What you see as an acceptable color is the image on your screen, which is not the same as ink on paper."
The cost structure of a white sample is also worth mentioning: white samples usually carry no prototyping fee, because many printers treat them as a pre-sales service. No printing is involved, no ink is consumed, and no press time is used, so the main cost is time, normally 2 to 3 days, or faster when needed.
The Second Boundary: Structural Mock-Up—Validate Handling, Not Production Consistency
The second type is the structural mock-up, also commonly called a greyboard mock-up or structural sample.
Its difference from a white sample lies in the materials and finishing. A white sample is usually quickly assembled from ordinary white cardboard, while a mock-up uses materials close to the final version: the actual greyboard thickness, the actual specialty paper, the actual laminating and wrapping process, the actual carrying cord, magnets, labels, and inserts. The finished item already looks and feels much like the final product, except for printing and surface finishing.
A mock-up is therefore suited to a different set of questions:
First, opening and closing feel. The smoothness of a drawer box, the tightness of a base-and-lid box, the rebound of a hinged lid, and the strength of a magnetic closure. These qualities cannot be adequately described through structural parameters and must be judged by handling the physical sample.
Second, direction of the tactile experience. Whether the material feels rigid or soft, matte or smooth, and how the paper edges feel. When a brand says, "We want a premium feel," this cannot be discussed using a white sample, but it can be discussed using a mock-up.
Third, the relationship between the insert and the product. Whether the insert holds the product securely, whether the product moves, and whether removing it also lifts the product out. This is critical for products such as fragrances, glassware, and ceramics.
What it cannot validate: color and printing effects, or consistency during mass production. A mock-up is handmade, while mass production is performed by machinery. This difference is very noticeable for certain structures. The rigidity of hand wrapping and machine wrapping is not identical, and the bonding position of hand-assembled boxes and machine-assembled boxes is not identical. Therefore, approval of a mock-up does not mean that mass production will be exactly the same.
A mock-up costs considerably more than a white sample because it requires additional material preparation, additional labor, and sometimes a small sample of surface finishing such as hot stamping. The lead time is typically 5 to 7 days.
A client said: "We have already made the mock-up, so why do we still need a color proof?"
We replied: "Because the mock-up is handmade, while the color proof is made by machinery. Also, the color on the mock-up is produced on a process swatch, not printed on the paper you will actually use."
The Third Boundary: Color Proof—The First Sample Close to Production, but Still Not Production
The third type is the color proof, also called a color sample or press proof. It is produced on production equipment using the final approved materials and processes and the final approved artwork.
It is the first sample to approach the production result and can validate:
First, color. This is its core value: what the color looks like on the actual paper, under actual printing conditions, and after actual finishing processes such as lamination, hot stamping, and UV coating. Offset and digital printing inks behave differently, different papers absorb ink differently, and surface finishing can shift colors. These effects are visible only on a color proof.
Second, the interface between printing and post-printing. Whether to hot-stamp first or laminate first, how lamination tension affects hot stamping, and how UV coating performs on a matte surface. These sequence issues cannot be seen on a white mock-up.
Third, the overall effect. This stage is used for internal decisions, client approval, product photography, and trade-show samples.
It is still not mass production because: color proofs are usually produced on a single machine in a single batch, while mass production is a continuous long run. Ink color can shift slightly over time, paper batches vary, and machine conditions differ. Clients can usually accept these differences for most orders, but for color-sensitive products, particularly cosmetics and certain foods, the acceptable color-difference tolerance must be clearly stated in the contract.
A client said: "The color proof looks fine. Can we go straight into production?"
We replied: "Yes, but two matters must be settled first: how color-difference tolerance will be judged, using ΔE or a visual standard, and how the reference sample will be retained. Without defining these in advance, production will inevitably lead to disputes."
A color proof has the highest cost and longest lead time of the three, normally 7 to 12 days depending on process complexity. It takes longer when hot stamping, lamination, and UV coating are combined.
When a Printer Receives a New Brand's First Sample Order, Which Three Numbers Should Be Asked First
Once these three boundaries are combined, the operation reduces to three questions.
The first number: what this sample round needs to validate. This is the most important question because it directly determines which type of sample to produce. Choosing the wrong direction wastes both money and time. If the client's requirement is "I want to know whether this structure works," the answer is a white sample. If it is "the client thinks our product is difficult to remove," the answer is a mock-up with an insert. If it is "I want to show the result to the brand owner," the answer is a color proof. Many clients vaguely say, "Let's make a sample and see." In that case, the printer should break the request down rather than simply asking, "What type of sample do you want?"
A client said: "Let's make a sample and see."
We replied: "What would you like to see first, whether the structure works or whether the color looks right? These require completely different samples, with different methods, lead times, and costs."
The second number: how many revisions this sample round will require. Each revision requires a complete sample cycle, and charges are calculated by round. Our quotations state that the prototyping fee includes N rounds of revisions, with additional rounds charged separately. This number must be confirmed before work begins. Many new-brand clients underestimate the number of revision rounds because their artwork is revised on a computer, while the problems visible on a physical sample cannot be seen on a computer: colors change, materials reflect light, and proportions may look fuller or slimmer in physical form.
Our factory's experience is: the first color proof generally requires 1 to 2 rounds of revision to converge, while a structural white sample usually requires no more than 1 round, because structural issues are immediately apparent on a white sample. For clients with limited budgets, we recommend finalizing the structure during the white-sample stage before proceeding to a color proof, which can save the cost of an entire color-proof round.
The third number: who will review this sample round. The answer determines the trade-off between precision and cost.
For internal decision-making, such as when the founder must decide whether to continue developing the packaging, the sample can be simpler. A white sample and a basic mock-up should be sufficient, with the savings reserved for mass production.
For client approval, where the brand's procurement team or brand manager will review and sign off, a color proof is required. The wording of the approval stage must also be clear: whether the client is approving the artwork or the physical sample, and which changes made after approval will be charged.
For trade shows, channels, or photography, where the sample will be shown externally or used in promotional images, a color proof is needed, but additional considerations arise. It may be necessary to produce a separate "presentation-grade" sample, generally at mock-up level but with finished surface decoration, because trade-show samples will be handled and the best unit cannot be selected from a production batch.
A client said: "I am sending this sample to the brand owner for review."
We replied: "Then the approval form must clearly state what you are approving. Our standard approval form includes a section titled 'Scope of Approval': whether approval covers the appearance of the artwork or the color, materials, and finishing performance of this physical sample. The difference matters because color is affected by differences between the proofing machine and the production machine. Approval of a physical sample does not guarantee consistency across a long production run. If the client signs an 'Artwork Approval,' responsibility for production color deviation does not lie with the printer. If the client signs a 'Physical Sample Approval,' color-difference tolerance must be negotiated."
One Sentence for Clients
About prototyping, the most important message we want to send clients is: "The value of a sample lies not in how much it resembles the finished product, but in which question it can answer."
An expensive color proof used only to answer whether the structure works is a waste. A two-day white sample used to confirm the final color is a disaster, because a white sample contains no color information at all.
Our communication with clients therefore changed completely: before quoting, we ask three questions—what to validate, how many revision rounds, and who will review—then work backward to determine the sample type, number of rounds, and required precision. Define the question first, then define the sample.
We also often tell clients: "The prototyping fee does not purchase a sample; it purchases an answer." What the client buys with this fee is an answer to the question. If only one of three questions is answered after a sample round, the problem lies in the sample design, not in the quality of the prototype—the wrong question was asked.
Further Reading
- Why a Gift Box Prototype Was Rejected 3 Times: The Relationship Between Prototyping Fees, Production Prices, and Review Forms—How prototyping fees should be incorporated into production pricing
- 3 Realistic Allocation Rules for Gift Box Prototyping Fees—How Printer Prototyping Fees of 200-800 RMB Can Be Included in Production Pricing in 3 Ways—The rules for prototyping fees can cause more disputes than prototyping itself
- How to Charge Printer Design Fees When a Gift Box Physical Prototype Requires More Than 3 Revision Rounds—How to calculate charges when the number of revision rounds is exceeded
- Digital Proofing vs Production Printing: 3 Real Differences—The proofing machine is color-accurate, but the production machine has drifted; how to calculate the difference
FAQ
A client says, 'Let's make a sample and see.' Which type should the printer make?
Do not proceed directly. Actively break down the client's request, because 'make a sample and see' may refer to three entirely different things: checking whether the structure works (make a white sample), checking handling and tactile quality (make a structural mock-up), or checking color and printing effects (make a color proof). The correct approach is to ask three questions in return: what this round needs to validate, how many revision rounds are expected, and who will review this round. Use the answers to work backward to the appropriate sample type, number of rounds, and precision level. Starting with the most expensive option is wasteful, while starting with the cheapest carries risk: a white sample contains no color information, so if the client wants to approve the color, a color-proof round will inevitably be required afterward.
What exactly is the difference between a white sample and a structural mock-up? Are both necessary?
The difference lies in the materials and production method. A white sample is quickly assembled from ordinary white cardboard without printing and validates only the structure, including locking tabs, insertion tabs, lid gaps, dimensions, filling, and production-line formability. It is inexpensive, normally takes 2 to 3 days, and many printers provide it as a pre-sales service without charging a prototyping fee. A structural mock-up uses materials close to the final version, including actual greyboard thickness, specialty paper, wrapping processes, carrying cords, magnets, and inserts. It validates opening and closing feel, tactile direction, and the relationship between the insert and product, but because it is handmade, it cannot guarantee production consistency. The correct sequence is to resolve structural issues during the white-sample stage, where they are immediately visible, and reserve color-proof rounds for revisions that genuinely require color evaluation. This approach reduces both overall rounds and cost.
The color proof looks acceptable, so why is it still necessary to negotiate color-difference tolerance?
A color proof is usually produced on a single machine in a single batch, whereas mass production is a continuous long run. The two cannot be completely identical: ink color drifts slightly over time, paper batches vary, and machine conditions differ. For color-sensitive products, including cosmetics, some foods, and projects with strict brand requirements, failure to define the acceptance tolerance in the contract in advance will almost inevitably lead to disputes after production. Printers should specify two matters during the color-proof stage: whether acceptance will be judged using ΔE values or a visual standard, and how the retained reference sample will be managed, whether as a sealed physical sample, a color card, or proof photographs. Which of these can serve as evidence during a dispute must be decided in advance. The approval form should also clearly state whether the client is approving the appearance of the artwork or the color, materials, and finishing performance of the physical sample, because the allocation of responsibility differs.
A client asks, 'The mock-up is already finished, so why do we still need a color proof?' How should this be explained?
There are two reasons. First, the mock-up is handmade while mass production is performed by machinery. The rigidity of hand wrapping and the bonding positions of hand-assembled boxes are not identical to those of machine production, so approval of a mock-up does not mean that mass production will be exactly the same. Second, the color shown on the mock-up is produced on a process swatch, not printed on the final paper. Ink absorption varies by paper, and post-printing processes such as lamination, hot stamping, and UV coating can shift the color. These effects are visible only when the sample is produced on production equipment using the final materials. A color proof is therefore the first sample to approach the production result rather than duplicated work.
How should prototyping fees be calculated, and what should happen if the number of revisions is exceeded?
Our factory's standard practice is to state on the quotation that the prototyping fee includes N rounds of revisions, with additional rounds charged separately. The starting price is normally in the range of 200 to 800 RMB, depending on process complexity, including whether hot stamping, lamination, UV coating, or an irregular structure is required. The number of rounds must be agreed because every revision requires a complete sample cycle, including renewed materials and labor. In practice, the first color proof generally requires 1 to 2 rounds of revision to converge, while a structural white sample usually requires no more than 1 round because structural problems are immediately visible. For clients with limited budgets, we recommend resolving structural issues during the white-sample stage before proceeding to a color proof, which can save the cost of an entire color-proof round. Prototyping fees may also be allocated within the production price, and the applicable method should be specified before the contract is signed.
What is the difference between trade-show samples, photography samples, and the first production batch, and what should printers recommend?
The three have different uses and precision requirements. Trade-show samples are shown to others and may be handled, so an additional presentation-grade sample is often needed, generally at mock-up level but with finished surface decoration, because the best unit cannot be selected from a production batch. Photography samples must support the intended photographic effect and may require specific materials or presentation under particular lighting. The first production batch is a genuine production run, and its color reflects the actual result of continuous long-run production. Printers should recommend modestly increasing precision for trade-show and photography uses because the quantities are small and do not carry consistency risk. The first production batch and sealed reference sample should receive closer attention because they represent what the client receives. The contract should clearly link each sample's intended use with its corresponding acceptance criteria.
📚 📚 Related Recommendations
Need a Custom Packaging Solution?
Learn more about packaging, or consult directly for a custom solution and quote