---
title: "The chemicals a garment carries"
description: "Dyes, prints, washes and finishes introduce chemical decisions that need records from the places doing the work, alongside tests of the finished clothes."
url: "https://surajmalstudio.com/guides/chemicals-in-clothes"
---
# The chemicals a garment carries
7 min read Materials and responsible choices Updated 8 Sept 2026
Dyes, prints, washes and finishes introduce chemical decisions that need records from the places doing the work, alongside tests of the finished clothes.
Market-specific guidance. Sources and review information are included below.
## Quick answers from this guide
### Which clothing decisions introduce chemicals that need checking?
The choice of dye, print, wash or finish shapes the chemical products used to make clothes. A change to the colour, the feel of the fabric or the print effect may change those products or the way they are used. Record where each treatment happens and ask for evidence covering the chemical products used there, keeping it linked to the approved sample.
### What does a chemical test of finished clothes prove?
A chemical test reports whether the sample sent to the laboratory meets the stated limits for the substances tested. The report needs to identify the sample and the requirements used. A finished-clothing test does not show every chemical product stored or used at the place doing the dyeing, or what entered its wastewater. Those questions need separate records from that place.
### How are legal chemical restrictions different from a brand's requirements?
Legal restrictions apply according to the clothes and the market where they are sold. In the European Union, REACH Annex XVII restricts specified substances, mixtures and articles under conditions set out in each entry. A brand's written chemical requirements can bring together applicable restrictions and additional requirements. The test request should identify the version of those requirements being used for the clothes.
### What do ZDHC and OEKO-TEX documents tell a clothing brand?
ZDHC documents can provide evidence about named chemical products, the chemical products recorded at a particular factory, or wastewater test results. ZDHC's chemical input rules are voluntary industry requirements. OEKO-TEX STANDARD 100 certifies named textiles against the scheme's harmful-substance criteria. Read each document for the question it answers, then check that its dates and coverage match the clothes or the place doing the relevant work.
### When should chemical records be checked again?
Review chemical records when the dye, print, wash or finish changes, including changes made after a sample is approved. A colour correction or a different printing ink can alter the chemical products used without changing the clothes' measurements. Before production proceeds with the change, record what changed and who approved it, then review the supporting evidence and whether the planned tests need updating.
The chemicals a garment carries need checking against limits for the finished clothes, while the dyes, prints, washes and finishes used to make them need their own supporting records. These checks answer different questions. A passing test tells you about the sample sent to the laboratory. Records from the places treating the fabric tell you about the chemical products entering the work.
The connection between them is the garment itself. Keep the evidence attached to the particular fabric and colour, through the treatments used to make the approved clothes. A general promise from the maker leaves that connection unconfirmed.
Studio illustration Dyes, prints, washes and finishes introduce chemical decisions that need records from the places doing the work, alongside tests of the finished clothes.
## 01Colour, print and feel are chemical decisions
A chemical decision can begin with a comment on a sample. Make the colour darker. Change the print effect. Adjust how the fabric feels. Each may change the chemical products used or the way the fabric is treated. Record the change alongside the sample it affects so that approval of the appearance also leads to a review of the work needed to produce it.
Dyeing introduces one set of choices. Printing may bring a different ink system, while washing and finishing have their own chemical products. Coatings and cleaning products also fall within the manufacturing inputs covered by ZDHC's chemical restrictions. Looking only at the main fabric leaves some of the work unexamined.
Start the record when discussing the clothes with the maker. Describe the intended fabric and colour, then record any printing, washing or finishing proposed. Ask where each operation will happen. The place sewing the garment may be sending it elsewhere for a wash, so its own assurance does not answer every question about that treatment.
Keep each approved sample connected to this record. The sample shows the agreed result; the record explains the route used to reach it. Both need reviewing when that route changes.
## 02Restrictions on finished clothes need a named set of requirements
A finished-clothing check starts with a written list of the substances to check and the limits the clothes must meet. That gives the laboratory a defined request. It also gives the brand and the maker a shared reference for reading the result. Ask for the version of the requirements to be named in the test request.
The applicable limits depend on the product, its materials and the market where it will be sold. In the European Union, REACH Annex XVII contains restrictions on specified substances, mixtures and articles. Each entry sets its own conditions. Check the relevant entries through the [European Chemicals Agency's restrictions page](https://www.echa.europa.eu/substances-restricted-under-reach) when establishing the requirements for clothes sold there.
The brand's written requirements can bring together applicable legal restrictions and additional requirements for the clothes. Keep that distinction visible in the record. A voluntary scheme has its own criteria; applicable law still needs a separate check. A certificate cannot decide which market's rules apply to the order.
Settle the requirements and proposed tests during the initial discussion with the maker, alongside the material choices. Leaving them until the clothes are ready moves the first clear check to a point when dyeing and sewing may already be complete.
## 03A passing test belongs to the sample tested
A laboratory report can identify the garment or material submitted, the test method and results, and the limits used. Read it for those details. Check the sample date and whether the description connects the tested sample to the clothes being made. A report without a clear sample identity leaves a gap, even when every reported result passes.
The test describes that submission at the point it was tested. It does not reconstruct every chemical product used at the place dyeing the fabric. Nor does it show the instructions followed for each production batch or what entered the wastewater. Keep the finished-clothing report with the separate records covering those parts of the work.
The reverse also applies. Records showing that a factory checks its chemical products do not establish that the particular finished clothes meet the brand's stated limits. Keep the agreed finished-clothing tests in the plan even when the factory provides detailed records about the products it uses.
A failed test late in production can mean remaking material or changing a treatment. A shipment may need to wait while the cause is traced. Checking the chemical products before they are used creates an earlier opportunity to find a problem. It does not remove the final check.
## 04The places treating the fabric need to provide their own records
Build a record of where the clothes go. Name the place doing the dyeing and connect it to the fabric it handles. Do the same for any printing, washing or finishing. This makes it possible to ask the relevant place for evidence instead of collecting a general statement that covers an unclear part of the order.
Ask for the record of chemical products at each relevant site and evidence showing how those products have been checked. The site name and update date matter. So do the product names or identifiers that connect a chemical product to its supporting document. A record that predates a changed treatment needs reviewing against the current work.
ZDHC's [manufacturing chemical restrictions](https://mrsl.roadmaptozero.com/mrsl/mrsl_index/index.html) cover substances banned from intentional use in chemical products used to process textiles, clothing and footwear. The limits apply to the chemical products sold for manufacturing use. These are voluntary industry rules, with a different purpose from the limits checked in finished clothes.
Use those records to follow the chosen treatment. A statement that a factory follows ZDHC does not identify which products it has recorded, when they were checked or whether the evidence covers the site handling the order. Request the underlying documents with those details attached.
## 05ZDHC reports answer separate questions about products and wastewater
The names on ZDHC documents describe different kinds of evidence. A ChemCheck Report provides information about a named chemical product and how it meets ZDHC's chemical input requirements. Check the product name, who issued the report and its current status. The [ZDHC Gateway Chemical Module](https://knowledge-base.roadmaptozero.com/hc/en-gb/articles/360009224998-What-is-the-ZDHC-Gateway-Chemical-Module) provides chemical-product information and these reports.
An InCheck Report looks across the chemical products recorded at a site and highlights how far that record meets ZDHC's input requirements. Read it alongside the period it covers and the completeness of the underlying record. Its usefulness rests on whether it describes the relevant place and the chemical products recorded there.
A [ClearStream Report](https://knowledge-base.roadmaptozero.com/hc/en-gb/articles/7117656613405-ZDHC-ClearStream-Report-Frequently-asked-questions-Suppliers) presents wastewater test results against the applicable ZDHC wastewater guideline. Where the work includes dyeing, printing, washing or finishing, check the wastewater evidence for the place performing that work. Read the sample date and the individual results, as well as the guideline used.
These documents should remain separate in the review. A wastewater result does not show that every chemical product was used correctly. An inventory report does not identify the finished garment submitted for testing. Keep each document linked to the question it can answer and the place or product it covers.
## 06An OEKO-TEX certificate must cover the proposed textile
[OEKO-TEX STANDARD 100](https://www.oeko-tex.com/en/our-standards/oeko-tex-standard-100) is a label for textiles tested for harmful substances. OEKO-TEX states that the certified article has passed the scheme's safety tests. That provides evidence about the article named on the certificate, within the certificate's stated coverage.
Before relying on it, check the certificate number and validity. Read which textile it covers and its product class, meaning the category used within the scheme. Check any limits on its coverage against the material proposed for the clothes. A current certificate may still concern a different article from the one being ordered.
The certificate does not make a claim about every chemical product used throughout a factory. Keep the records from the places dyeing or finishing the fabric alongside it. The certificate and those records have different jobs, and the finished clothes still need the checks set out in the brand's requirements.
## 07A changed treatment reopens the chemical check
An approved sample is a reference for production. Keep the agreed dyeing, printing, washing and finishing details with it, together with the planned tests. Before ordering production material, record who confirms any change to those details. Approval of a new appearance needs a corresponding decision about its supporting chemical evidence.
A colour correction may introduce an extra chemical product. Printing for production may use different inks from the sample. A separate washing factory may enter the process after the fabric and sewing work have already been reviewed. Each change needs to be followed through the records, even if the garment's measurements stay the same.
Keep one file for the clothes, connecting the current chemical requirements to the places doing the work. Attach the relevant chemical-product records and wastewater evidence, then the finished-clothing test report. Record what changed after approval, who accepted the change and what was checked or tested again.
Before releasing the clothes, match the final report to the production garment and review any failed result and subsequent test. The file should make it possible to follow a particular colour from the approved sample through the treatments used to the final evidence. That is the basis for deciding whether the clothes meet the agreed chemical requirements.
## Sources
Official sources and further reading are linked below. Regulations change; confirm current requirements for your product and market.
[European Chemicals Agency: substances restricted under REACH →](https://www.echa.europa.eu/substances-restricted-under-reach) [ZDHC manufacturing chemical restrictions →](https://mrsl.roadmaptozero.com/mrsl/mrsl_index/index.html) [ZDHC Gateway Chemical Module →](https://knowledge-base.roadmaptozero.com/hc/en-gb/articles/360009224998-What-is-the-ZDHC-Gateway-Chemical-Module) [ZDHC ClearStream Report frequently asked questions →](https://knowledge-base.roadmaptozero.com/hc/en-gb/articles/7117656613405-ZDHC-ClearStream-Report-Frequently-asked-questions-Suppliers) [OEKO-TEX STANDARD 100 →](https://www.oeko-tex.com/en/our-standards/oeko-tex-standard-100)
[Subscribe to new guides on the website.](https://surajmalstudio.com/guides/chemicals-in-clothes)
Working on a range
Get help turning the next decision into a practical plan.
[Talk about your idea](https://surajmalstudio.com/enquire)
## Read next
### [Can a new brand call its clothes sustainable?](https://surajmalstudio.com/guides/can-i-say-my-clothes-are-sustainable)
A sustainability claim needs evidence matching its exact wording and the finished clothes; a certificate for one material cannot support a claim about everything.
### [Knowing where the clothes actually came from](https://surajmalstudio.com/guides/where-clothes-come-from)
Tracing clothes means connecting each order to records for its fabric, yarn and fibre, and keeping every statement about origin within what those records support.
### [Recycled fibre, and what the claim rests on](https://surajmalstudio.com/guides/recycled-fibre-claims)
A recycled-content claim needs a clear fibre name and percentage, supported by documents that connect the material to the clothes being sold.
### [What an organic cotton claim has to be backed by](https://surajmalstudio.com/guides/organic-cotton-claims)
An organic cotton claim needs certificates for the businesses and goods involved, records linking the material to the clothes, and wording supported by that evidence.
Read next [Can a new brand call its clothes sustainable? 5 min read · Materials and responsible choices](https://surajmalstudio.com/guides/can-i-say-my-clothes-are-sustainable) [Knowing where the clothes actually came from 7 min read · Materials and responsible choices](https://surajmalstudio.com/guides/where-clothes-come-from) [Recycled fibre, and what the claim rests on 7 min read · Materials and responsible choices](https://surajmalstudio.com/guides/recycled-fibre-claims) [What an organic cotton claim has to be backed by 7 min read · Materials and responsible choices](https://surajmalstudio.com/guides/organic-cotton-claims)
---
[View this page on the website](https://surajmalstudio.com/guides/chemicals-in-clothes)