Eurofins | BLC Azo Dyes Testing and Screening Services

Eurofins | BLC offers UKAS accredited azo dyes testing of textile and leather products for compliance with the EU REACH regulation and other international legislation to the following methods:


Testing Method

Material Group


BS EN ISO 17234-1:2020



Chemical tests for the determination of certain azo colorants in dyed leathers

BS EN ISO 17234-2:2011


Chemical tests for the determination of 4-aminoazobenzene

BS EN ISO 14362-1:2017


Detection of the use of certain aromatic amines derived from azo colorants

BS EN ISO 14362-3:2017


Detection of the use of certain aromatic amines derived from azo colorants, which may release 4-aminoazobenzene



Why do you need to test for Azo Dyes?

Azo dyes may be used as colourants in the leather and textiles sector for a variety of consumer products. Certain azo dyes can under reactive conditions cleave to produce primary aromatic amines which are known carcinogens and classified as skin sensitisers.


Azo dyes are also regulated by chemical legislation including REACH, China GB Standards and California Proposition 65. Therefore, it is the responsibility of manufacturers, brands and retailers to carry out azo dyes testing to ensure compliance for products that imported and retailed globally.


What types of products are azo dyes usually found in?

Azo dyes can be used in a wide range of substrates such as:

  • Textile
  • Leather
  • Plastic
  • Paper
  • Mineral oil
  • Wax


How long does Azo Dyes testing take?



Turnaround Time



3-5 working days







Below is a list of our most popular chemical tests:


Please read our testing terms and conditions.


What are azo dyes?

Azo dyes are a group of dyes that may often be used as colourants in the textiles industry for their increased colour fastness properties and for providing a wide range of vibrant colours.


What are the risks of not testing for azo dyes?

Azo dyes are regulated internationally through a number of different chemical regulations (which are detailed in the next section), therefore, if your business imports/exports, manufactures or retails products internationally, you are legally obliged to comply with the relevant geographical regulation.


Failure to comply may result in damage to brand reputation and may also have a significant financial impact on the business through fines imposed by regulatory bodies and product recalls.


Are azo dyes regulated in any chemical legislation?

Azo dyes are widely regulated through a number of international chemical regulations:

  • Annex XVII of REACH regulation
  • China Guobiao Standards (GB Standards)
  • California Proposition 65 (Prop 65)


Can’t find the answer to your question?

Contact Eurofins | BLC’s chemical experts today on +44 (0) 1604 679 999, email [email protected] or complete the contact form at the bottom of this web page.


Accredited Azo Dyes Testing for Consumer Products

Eurofins | BLC’s analytical testing laboratory is accredited by UKAS (0076), ILAC and CPSC (1049) and regularly participates in proficiency testing programmes.

Eurofins | BLC are proud to work with a wide variety of organisations from around the world from chemical companies and product manufacturers to brands and retailers, testing a diverse range of consumer products. We are in a unique position, with over 95 years’ experience of leather and related products, to identify the compounds that are likely to be present in materials tested, where they may originate and the likelihood of false-positive results.

For azo dyes testing, Eurofins | BLC provides:

Chemical testing at an internationally accredited testing laboratory in the UK

  • Competitive pricing
  • Fast chemical testing turnaround times - most test results available within 3-5 working days
  • Both the testing and the understanding of the results provided
  • A comprehensive and easy to understand test report
  • Technical back up and support from chemical testing experts
  • Chemical compliance and product safety training courses for your staff


Become a Eurofins | BLC Member and access:


View Eurofins | BLC Membership Benefits

Our Accreditations

Eurofins | BLC holds accreditations from UKAS and CPSC and has auditors approved to carry out LWG audits. Trust Eurofins | BLC to deliver some of the most accurate test results in the industry.

View our Accreditations


"I enjoyed all of the leather course as a chemist I wanted to understand the whole process of making leather."

Smit & zoon


"Eurofins | BLC Membership allows us to develop innovative high quality raw materials in order to continue our product improvement programme."


United Kingdom

“10 years of Eurofins | BLC Membership has enabled us to provide continuous assurance of product quality and safety, giving our customers greater confidence in our products.”


United Kingdom

"We thought every part of the Eurofins | BLC leather course was very informative and interesting."

John Lewis Partnership

United Kingdom

"I just wanted to say a big thanks for 2 great days of leather education last week."



"All parts of the leather training course were relevant and very informative. I now have a new appreciation for leather!"

Ralph Lauren

United States of America

"Smart chemical testing of wet blue saves our business time and money."

Casino Hide Tanners


"We were very impressed by the speaker on the leather training course who had excellent knowledge of the subject."


United Kingdom

"I enjoyed the combination of theoretical and practical training on the 4-day leather course."


United Kingdom

"Membership allowed us to use the expertise of Eurofins | BLC to improve our suppliers' environmental performance."

Clarks International

United Kingdom

"Through Eurofins | BLC Membership, we have access to technical support for leather product testing, helping us to provide more efficient services to our customers."

William Lamb

United Kingdom

"I became a Member to take advantage their specification building services and 1-2-1 regulatory advice."

Gheli International


Send An Enquiry

Contact Eurofins | BLC to discuss your enquiry with friendly and helpful experts and to get a quotation. For Eurofins | BLC to receive your enquiry, you must complete all 3 sections of the contact form below. To receive the Technical Update email, you simply need to complete this form. Eurofins | BLC aim to respond to all enquiries within 24 hours Monday to Friday.

  • Step 1 Tell us about your enquiry
  • Step 2 Tell us about your business
  • Step 3 Tell us how we can contact you

Select your enquiry category

Type your enquiry

Tell us about your business

Tell us how we can contact you