How Sampling and Formula Revisions Work

Product sampling and formula revisions turn a written brief into a commercially viable product. For skin care, cosmetics, hair care, body care and supplements, the first sample is usually a structured development step rather than a finished formula awaiting approval. Each round should answer specific questions about performance, sensory experience, claims, packaging, cost and manufacturability.

A disciplined review process helps founders reach approval faster. It also prevents subjective feedback, uncontrolled changes and late surprises during testing or scale-up. This guide explains what happens before a sample is made, how to evaluate it, how revisions work and when a formula is genuinely ready to progress.

What is a formulation sample?

A formulation sample is a development version produced at laboratory scale so the project team can assess whether the formula is moving towards the approved brief. Depending on the category, it may be evaluated for texture, appearance, aroma, flavour, dispersion, application, absorption, rinse-off, after-feel or other performance attributes.

The sample is not necessarily representative of every feature of commercial production. Laboratory equipment, batch size, processing conditions and packaging may differ from the final manufacturing environment. It is best understood as evidence within a staged process: brief, prototype, revision, formula approval, testing, scale-up and commercial production.

Why the first sample is rarely the final product

Even an experienced formulator must translate brand language into measurable product characteristics. Terms such as “luxurious”, “light”, “clean”, “fast absorbing” or “premium” can mean different things to different people. The first sample makes those preferences tangible.

It may confirm that the direction is correct, reveal competing objectives or show that the benchmark cannot be matched within the target cost and ingredient restrictions. That is useful progress. A first sample that creates clear decisions can be more valuable than one that receives vague approval and later fails to meet commercial expectations.

What should be resolved before sampling starts?

The quality of the first sample is strongly influenced by the quality of the brief. Before laboratory work begins, define the following as clearly as possible:

• product category, format and intended use;
• target consumer and the problem the product addresses;
• reference products and what specifically should be matched or avoided;
• desired appearance, texture, aroma, flavour and finish;
• priority ingredients and ingredients that must not be used;
• proposed claims and the evidence they may require;
• pack size, dispensing system and packaging direction;
• target retail price, target product cost and sales channel;
• market, regulatory classification and label requirements;
• launch timing and expected manufacturing quantity.

Use APL’s guide on preparing for a manufacturer discovery call to organise these decisions before development begins.

How the initial formulation is developed

The formulator reviews the brief for technical compatibility. They select a formula architecture, candidate raw materials and an appropriate process. They may also identify conflicts: a very light sensory profile may be difficult to reconcile with a high level of a heavy active; a natural preservation preference may affect packaging and shelf-life strategy; or a target cost may not support every requested ingredient.

At laboratory scale, ingredients are weighed, processed and recorded against a controlled formula version. Observations such as temperature, mixing order, pH, viscosity and appearance may be captured. The sample is then filled into a suitable evaluation container, labelled and issued with a version identifier so feedback can be traced accurately.

How to assess a sample properly

Evaluate the sample against the approved brief rather than asking only whether you “like it”. Use consistent conditions, record observations and separate immediate sensory reactions from performance over time.

Appearance

Review colour, opacity, gloss, uniformity and any visible separation or settling. Consider whether natural ingredients are expected to produce batch-to-batch variation and whether the chosen packaging changes how the product appears.

Aroma or flavour

Assess intensity, character, sweetness, aftertaste and how the profile develops during use. For fragranced products, check both the immediate impression and the residual scent. Avoid requesting “stronger” without explaining which note or stage is too weak.

Texture and application

Describe pickup, spread, slip, cushion, absorption, tack, drag, foam, rinse and after-feel as relevant. Compare the sample with the reference product side by side and identify the exact difference.

Function in real use

Use the product as intended and in the intended quantity. A moisturiser tested in an excessive layer, a shampoo used without a normal wash routine or a powder prepared outside its directions may produce misleading feedback.

Packaging interaction

A formula that feels right in a laboratory jar may dispense differently from a pump, tube, sachet or dropper. Packaging compatibility requires formal evaluation, but early dispensing observations can prevent an unsuitable component direction from progressing too far.

Use a scorecard instead of scattered comments

A simple scorecard makes feedback comparable between reviewers and rounds. Use a consistent scale—for example, one to five—and include a short factual note for each attribute.

Attribute	Question	Useful feedback
Viscosity	Does it suit the pack and use?	Too fluid for the proposed pump; increase slightly.
Spread	How easily does it move?	Good initial slip but becomes draggy after 20 seconds.
Finish	How does skin or hair feel?	Reduce residual tack while retaining moisturised feel.
Scent	Is the profile and strength right?	Opening is suitable; residual vanilla note is too sweet.

A shared document is better than separate messages from founders, marketers and advisers. Nominate one project lead to consolidate comments, resolve contradictions and submit one approved response.

What makes revision feedback actionable?

Good feedback identifies the observed issue, its importance and the desired direction. “Make it better” or “not premium enough” gives the formulator little technical information. A more useful instruction might be: “The cream feels rich on application but remains tacky after five minutes; keep the initial cushion and reduce the residual tack.”

Prioritise feedback as:

• must change: the sample cannot be approved without this change;
• preferred: improvement is wanted if it does not compromise stability, cost or another priority;
• observation: information to monitor, not necessarily a revision request.

Where reviewers disagree, the brand should decide before sending instructions. Asking a formulator to make a product simultaneously thicker and more fluid, richer and faster absorbing, or stronger and less noticeable leads to unnecessary rounds.

What happens during a formula revision?

The formulator reviews the consolidated feedback against the formula, process, cost and constraints. They determine whether the requested outcome requires a small adjustment, a change in raw material, a process change or a broader reformulation.

Every revision creates a new controlled version. One adjustment can affect several attributes: increasing viscosity may alter dispensing and spread; changing fragrance can affect colour or compatibility; reducing oiliness can change barrier feel; replacing an ingredient can affect preservation or claims. For this reason, the complete revised sample should be assessed, not just the attribute that prompted the change.

How many sample rounds should a project need?

There is no universal number. A close adaptation of an established base may need fewer rounds than a novel custom formula with unusual sensory goals, restricted ingredients or a tight cost target. Progress also depends on the speed and quality of brand feedback.

The objective is not to maximise revision rounds. It is to reach a formula that satisfies the agreed acceptance criteria and is suitable to progress into testing and scale-up. Revisions made without a clear decision framework can continue indefinitely while adding time and cost without improving commercial viability.

Control scope during development

A revision refines the agreed product. A scope change alters the project itself. Adding a new claim, changing from a jar to a spray, removing an ingredient category, switching markets or requesting a lower target cost may require redevelopment rather than a routine revision.

When a new request appears, ask:

• Does it change the product format or core function?
• Does it require different ingredients, testing or packaging?
• Does it conflict with an approved priority?
• Will it affect the development fee or timeline?
• Should the current version be completed before a separate variation begins?

Clear scope control is one of the best ways to avoid the most common product development mistakes.

Formula approval is not the end of development

Approval of a laboratory sample confirms the selected formula direction. It does not replace stability, preservative efficacy, packaging compatibility, claims substantiation, regulatory review or commercial-batch release requirements.

The required program depends on the product and claims. Review APL’s product testing services before committing to launch dates or bulk packaging. Testing may reveal that the formula, process, packaging or storage instructions need adjustment.

Sampling and packaging should develop together

Packaging is a functional part of the product system. The formula’s viscosity, chemical composition, oxygen or light sensitivity and intended dose can influence component choice. The pack can also change the consumer’s perception of texture and performance.

Shortlist packaging early enough to inform development, but avoid ordering the full commercial quantity before compatibility and specifications are understood. Obtain samples of the proposed components, confirm fill volume and headspace, and consider whether decoration, liners, seals or closures introduce additional variables.

When is a formula ready for scale-up?

A formula is ready to progress when the decision-makers have approved a defined version, the product meets the documented acceptance criteria and outstanding risks have a clear testing or manufacturing plan. The project file should identify:

• the approved formula and sample version;
• signed or recorded approval from the authorised brand representative;
• final sensory and functional criteria;
• target packaging and fill requirements;
• agreed claims and required evidence;
• testing plan and acceptance criteria;
• target cost and commercial quantity;
• known risks, dependencies and unresolved decisions.

Scale-up then examines how the formula transfers from laboratory equipment to commercial manufacturing. Read what happens during manufacturing scale-up and the guide to product manufacturing timelines.

Ways to reduce avoidable revision rounds

1. Write a specific brief. Separate essential requirements from preferences.
2. Use relevant references. Explain which feature of each reference matters.
3. Choose decision-makers early. Avoid adding new reviewers late in development.
4. Test consistently. Use the product as directed and record the conditions.
5. Consolidate feedback. Submit one approved response for each version.
6. Prioritise changes. Identify must-change items and acceptable trade-offs.
7. Respect technical dependencies. Understand that one change can affect other attributes.
8. Freeze the brief. Treat major new directions as scope changes.
9. Plan packaging and testing. Do not judge the formula in isolation.

Frequently asked questions

Is the first sample supposed to be perfect?

Not necessarily. It should provide a credible interpretation of the brief and enough information to confirm the direction or request specific changes.

Can several people test the sample?

Yes, but use consistent criteria and nominate one person to consolidate feedback. The formulator should receive one clear instruction set rather than conflicting individual opinions.

Can I change the packaging during sampling?

Packaging can evolve, but a major format change may affect viscosity, dispensing, compatibility, testing, cost and timing. Raise it as early as possible.

Does formula approval mean the product is ready to sell?

No. Approval is followed by the relevant testing, documentation, scale-up, manufacturing and release steps.

Why can one requested change affect the rest of the formula?

A formula is an interacting system. Adjusting one ingredient or process condition can change texture, stability, preservation, colour, odour, cost or packaging behaviour.

What feedback should I send?

Describe what you observed, when it occurred, why it matters and the preferred direction. Rank each point as essential, preferred or an observation.

Develop your formula with Australian Private Label

A well-managed sampling process protects the brief while creating room for technical problem-solving. Come prepared with your product concept, reference products, target customer, claims, packaging direction, price point and launch plan.

Important: Development stages, included revision rounds, fees, testing and timelines vary by project and should be confirmed in the applicable proposal. Samples are for evaluation within the agreed development process and should not be treated as released commercial products.