Skin care product proofing, how to check and accept it effectively?

1. Freeze project briefing before proofing

The project brief at least states the target customer group, usage scenarios, category dosage forms, core experience, problems hoped to be solved, prohibited preferences, target price, net content, sales market, packaging material direction and reference samples. The reference sample should indicate whether it is based on skin feel, smell, appearance or packaging, rather than a general requirement that it be exactly the same.

Brands should separate necessary conditions from negotiable conditions. Necessary conditions are used to eliminate unqualified directions, and negotiable conditions are used by formulators to balance stability, cost and experience. Each time the briefing changes, the version and date must be updated.

2. Each sample must have a unique identity

The sample label should include the project name, version number, date, formula number, batch, packaging material or sample container, storage conditions and shelf life tips. After the brand receives it, record the appearance, sealing, shipping status and sample opening time.

Don’t communicate in terms of ‘what was in the pink bottle last time’. It is recommended to use the project abbreviation plus the round and sub-version, such as SRM-R2-B, and all feedback, photos, testing and sample submission records to reference the same number.

3. Confirm the structure in the first round and don’t rush to pursue perfection.

The first round focuses on determining whether the dosage form is correct, whether the spreading and absorption paths are close, whether there are obvious irritation or odor problems, and whether key raw materials can enter the system. At this time, you can compare two to three directions with clear variables, such as light and moisturizing, no fragrance and low fragrance.

Do not ask to modify the viscosity, fragrance, color, activity and packaging materials at the same time. Too many variables can make it impossible to identify sources of improvement in the next round. Feedback should be organized into three categories: necessary modifications, suggested improvements, and unchanged.

4. The second round of comparison using unified sensory vocabulary

The sensory evaluation can be broken down into sampling, appearance, smell, spreading, absorption, residue, stickiness, oiliness, smoothness, film formation and skin feel after use. Evaluators conducted the evaluation under the same dosage, same parts and similar environment, and tried to hide the identity of the samples to reduce brand and packaging bias.

‘Advanced’ and ‘easy to absorb’ are too general. A more effective expression is: the resistance is too high in the first three seconds of pushing, and the stickiness is still obvious after fifteen seconds. I hope to reduce the initial drag but retain the softness after use.

• Appearance: Color, transparency, gloss, uniformity, bubbles and visible particles
• In use: taking amount, spreading, drawing, chipping, absorption speed and instant scent
• After use: sticky, oily, smooth, tight, film-forming and residual odor

5. The third round aligns subjective feelings with specification data

After sensory confirmation, attention should be paid simultaneously to appearance, odor, pH, viscosity, density or other applicable specifications. Data is not meant to replace experience, but to establish repeatable ranges for production and release. Different equipment, rotors, rotation speeds, temperatures and measurement times will affect the results, and records must be recorded with methods.

Confirm the target value, allowable range, test method and sampling conditions for each indicator. Simply writing "viscosity qualified" is not enough to support subsequent batch comparisons.

6. Stability observation should answer the changing trend

Stability studies focus on a product's appearance, odor, color, pH, viscosity, delamination, precipitation, and microbial risk under simulated conditions of time, temperature, light, freeze-thaw, or transportation. The solution should be determined by product characteristics, packaging materials and target market. There is no fixed number of days that is suitable for all products.

Brands should distinguish between development screening, accelerated observation and formal support materials. Any abnormality should be recorded with the occurrence conditions, time, severity, recovery situation and treatment conclusion. Only qualified photos should be kept.

7. The compatibility of packaging materials must be verified with the final or equivalent structure.

The contents may affect plastics, coatings, adhesives, gaskets and pump heads; packaging materials may also absorb fragrances, migrate substances or change moisture. Common inspections include leaks, pump volume, spray pattern, suckback, blockage, discoloration, deformation, cracking, loss of printing and loss of contents.

Compatibility should be maximized using final materials, colors, sealing structures and decorative techniques. Only using laboratory glass bottles to confirm the formula does not prove that the final product packaging is suitable.

8. The feedback form must include actions and priorities.

A complete feedback includes sample number, tester, date, method, observations, expectations, priority, and acceptance of trade-offs. Photos or videos can be attached, but the images must correspond to the sample number and lighting conditions.

It is recommended to use a one-page form to manage: items to be maintained, items to be modified, items to be verified, responsible person, next round target and expected date of sample delivery. After the meeting, one party will formulate written minutes to avoid conflicting versions in multiple chat windows.

9. What fields should be included in the final signature form?

The final sample signature form at least includes product name, formula number, sample version, sample signature date, color and odor standards, sensory description, physical and chemical specifications, packaging material code, filling volume, photos, number of retained samples, approver and allowable deviation. Also indicate outstanding verification and release prerequisites.

Signing samples does not mean that mass production inspection can be skipped. It is the common benchmark for target samples between brands and factories, and mass production batches should be released based on approved specifications, process documents and inspection standards.

10. Set up transfer inspection from small trial to mass production

Before mass production, review raw material suppliers, formula proportions, feeding sequence, temperature, homogenization, cooling, filling conditions, packaging material versions and inspection methods. Changes in equipment scale may change shear, heat transfer, bubbles, and viscosity, thus requiring pilot or first batch follow-up.

After the first batch of production, keep batch records, inspection reports, samples of finished products and packaging materials, and record differences with signed samples. When deviations occur, investigate, evaluate and decide on rework, concession acceptance or scrap according to written rules.