Lab Dip Approval for Bag Fabrics: Freeze the Color Reference

A navy shell swatch is approved, but the bag also needs navy webbing, a zipper tape and a lining. Before that approval is forwarded to material suppliers, record exactly which component it covers. A useful lab dip approval identifies the physical color reference, the intended textile, the submitted version, the viewing conditions and the next decision. Keep that record with the development specification so an approved shade remains traceable when the assembled bag is reviewed.

This guide is for brand and procurement teams developing made-to-order textile bags. It focuses on the color reference and approval handoff. The finished bag still needs its own sample review, including how adjacent materials appear together and which color-exposure evidence the project requires.

Give the lab dip a defined job

A lab dip is a small dyed textile submission used during color development before bulk dyeing. Its value depends on the material and decision attached to it. A submission for the outer fabric can help select a shade direction for that fabric; the same approval should not silently become authorization for a different lining, finish or trim.

Write one sentence describing the decision before requesting submissions. For example: “Select the navy shade direction for the proposed outer woven fabric, using the retained physical standard and agreed viewing conditions.” The fabric specification can remain subject to separate construction or testing approval. This wording lets the supplier identify what is ready to decide and what remains open.

The distinction is practical when suppliers submit several options. Record whether the buyer is selecting one option, requesting a revision or asking for more information. “Looks fine” in a message thread leaves room for a preliminary preference to be treated as a final release.

Identify the reference that everyone will use

Give the color reference a stable identifier. It may be a retained physical swatch or another reference agreed with the supplier. Record who holds the controlling reference and how the corresponding supplier reference was identified. A picture in an email is useful for discussing the location of a shade issue, but screen settings, lighting and image processing can change how the color appears.

If a color-code system is used, include the complete reference and the agreed physical edition or material form where applicable. A short color name such as navy or stone is too broad to carry the approval alone. Keep the reference attached to the specific project and colorway rather than relying on someone remembering which sample was discussed.

Agree the viewing conditions with the material supplier. If more than one light source or an instrumental comparison is required, specify how those observations will be recorded and who resolves conflicting results. Avoid inventing a universal numerical tolerance. The appropriate criterion belongs in the project agreement and should be understood by the people making the comparison.

Build a component map before issuing approval

List the colored components that will be visible together. For a bag, that may include the shell, side panels, lining, binding, handles, webbing, zipper tape, thread and labels. The list should follow the actual proposed construction. An open-mesh beach carryall and a panelled jute tote need different color maps.

The following record is a planning example, not an approved specification or a claim that these materials have been sourced.

Some components may be intended to contrast. Record that intent rather than describing every difference as a mismatch. The buyer and supplier need a common understanding of which surfaces should coordinate and where variation requires a decision.

For printed areas, discuss the appropriate development submission with the supplier. A print or decoration approval can involve a strike-off or another agreed sample. Keep its artwork, substrate and process references connected to the color record instead of treating all color submissions as interchangeable.

Keep substrate and finish changes visible

A color decision is tied to the proposed material. Ask the supplier to identify the textile reference and relevant finish with each submission. If the fabric construction, surface treatment or supplier changes during development, return the color decision for review rather than carrying the old approval forward without explanation.

The same applies when a project changes from one material direction to another to meet cost, appearance or availability requirements. Record the reason for the change, the revised material identifier and which existing approvals are affected. That record helps prevent a later buyer from comparing the new submission against an obsolete version.

Keep the earlier approved sample and the revised submission identifiable. If the team chooses a new controlling reference, record when that change takes effect and which purchase-order or development version it applies to. Separate the archive from the active reference so an old swatch does not return to the production brief by accident.

Plan a separate comparison when bulk material is available. Agree which submission will represent the production lot, who will compare it with the retained approval and how that decision will be recorded before cutting is authorized. Link any accepted bulk reference to its lot identifier; the laboratory shade decision alone does not close this step.

Use decisions that have an owner and a boundary

Each approval entry should include the submission identifier, date, decision owner, decision and remaining action. Comments should describe the issue clearly enough for another person to follow it. “Too warm relative to reference R” gives the supplier a review direction; a vague comment such as “improve color” provides little basis for a revised submission.

If a submission is accepted subject to a condition, write that condition and the evidence needed to close it. State whether the condition prevents material release or will be checked at a later development stage. Do not let “approved with comments” become a label with no agreed operational meaning.

When several people review color, identify who can issue the final decision. A designer may express a visual preference while a procurement colleague is still resolving the material reference. Keep both observations in the record and make the release authority explicit.

Review the assembled bag as another decision

Place the approved material and trim submissions beside the assembled sample. Review the surfaces as they will sit together: an outer panel beside binding, handles against the shell, and the lining visible through the opening. Record which component versions were used to make that sample.

This review can reveal a coordination issue even when individual submissions were accepted. Ask whether the agreed appearance requires a material revision, a trim-color change or a construction adjustment that alters what is visible. Describe the chosen response and repeat the affected approval steps. An unexplained replacement makes the next sample harder to interpret.

Keep this stage connected to the custom bag sampling process. The approved assembled sample should reference the same active specification and color record used for the next development or production decision.

Keep appearance approval separate from exposure evidence

Record which colorfastness testing questions remain for the project. A shade-selection record describes the agreed appearance; a test report describes the submitted specimens under stated exposure conditions. The buyer needs both decisions to remain readable.

Ask the supplier or laboratory to identify the materials, colors and versions covered by any report. If the project changes a dark shell, pale lining or contacting trim, review whether the existing evidence still covers that combination. Avoid assuming that an appearance approval establishes resistance to rubbing, water, care or other exposures.

Before releasing the color record, check that another colleague can identify the controlling reference, find each accepted submission, see the open items and understand the next authorized step. That is the useful output: a colorway brief that can travel from development to material preparation without depending on an unrecorded conversation.

Sources

• Changle Textile: lab dip, strike-off and bulk shade control — explanation of distinct color-development submissions.
• Akyron: apparel lab dip approval — manufacturer guidance on linking shade submissions, material identity and approval records.
• AATCC TM8 public method summary — an example of a separately defined color-transfer evaluation, not a shade-approval rule.