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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Acid Red 407 is not readily biodegradable.

Additional information

By the nature of their design and use, dyes are not intended to be readily biodegradable as this would assist in the rapid destruction of the dyestuff, rendering it unfit for purpose. As such, it is accepted that such substances are not readily biodegradable under relevant environmental conditions. A published study (Pagga & Brown, 1986) describes the results of the testing of 87 dyestuffs in short-term aerobic biodegradation tests. The authors of this publication concluded that dyestuffs are very unlikely to show any significant biodegradation in such tests and that 'there seems little point in carrying out such test procedures’ on dyestuffs.


There are ISO, European, American (AATCC) and national standards for the colour fastness of dyes. Dyes are required to have specific fastness properties. If the dyes were biodegradable, it would not be possible for them to have these fastness properties.


Nevertheless Acid Red 407 was tested for biodegradation potential over the years. FAT 20202/E and FAT 20202/F were found to degrade 0 and 7 % after 28 days in the studies conducted according to OECD Guideline 302B. The BOD5/COD ratio was <0.5 in case of FAT 20202/E, FAT 20202/D, FAT 20202/B and FAT 20202/A as well. All these study results indicate that, Acid Red 407 is not readily biodegradable.