Textile Exchange Clarifies Dyed and Undyed Fiber Codes for Certified Supply Chains

Textile Exchange published Calibration 300 on September 1, 2026 to address inconsistent classification of dyed and undyed fibers in certified supply chains. The calibration took effect immediately and has a mandatory date of December 1, 2026.

The update is relevant to apparel buyers because color can be introduced at multiple production stages. If suppliers use different interpretations, product codes and certification records may no longer describe the same material history.

Pre-colored fibers count as dyed

Textile Exchange defines a dyed fiber as one where dyes or pigments have been intentionally applied for coloration at any stage. The examples include dope dyeing, stock dyeing, yarn dyeing, piece dyeing and garment dyeing.

This clarification addresses a known interpretation gap in which pre-dyed recycled fibers, including dope-dyed and spun-dyed fibers, had been declared as undyed yarns or fabrics.

Undyed has a narrower meaning

An undyed fiber is one with no intentional application of dyes or pigments for coloration. The calibration includes raw or greige fibers and fibers treated only with delustrants such as titanium dioxide within the undyed definition.

Suppliers should avoid deciding classification from the final fabric appearance alone. A pale or neutral fabric may still contain intentionally colored input, while a visually white material may have only a non-coloring delustrant treatment.

Where apparel data can break

• Polymer and fiber suppliers may describe dope-dyed input differently from spinning mills.
• Yarn records may omit color introduced before extrusion or spinning.
• Fabric mills may treat greige status as equivalent to undyed fiber status.
• Garment factories may copy a legacy material code into the bill of materials.
• Transaction documents may not match the approved product specification.

Buyers and factories should update controls now

Start by mapping the actual coloration stage for each certified material. Confirm terminology with the fiber producer, spinner, fabric mill, dyehouse and certification contact. Then update material masters, bills of materials, supplier declarations and document-review checklists.

For activewear and swimwear, dope-dyed synthetic yarns are common because color can be introduced before filament production. For hoodies and outerwear, coloration may occur at fiber, yarn, fabric or garment stage. Each route needs the correct code and consistent records.

Keep classification linked to production evidence

A practical file should connect the material code with purchase orders, process declarations, scope and transaction certificates where applicable, and the final product bill of materials. Teams should also train merchandisers and document reviewers so the distinction is checked before shipment.

The deadline gives certified organizations a short preparation window. Correcting master data early is safer than discovering mismatched classifications during an audit or transaction-certificate review.

Source: Textile Exchange — Standards Policy & Resource Updates, September 2026.