Name: Michael

Message: Would you know of any sources for the dyes: ERIOFAST BLUE 3G, ERIONYL BLUE A-4G and ERIONYL TURQUOISE A-G?  Are any of these dyes CI listed?  Please let me know.

Eriofast dyes were formerly produced by Ciba Specialty Chemicals and are now produced by Huntsman Textile Effects. Huntsman purchased the dye branch of the Ciba corporation in 2006. They are metal-free acid dyes for use on nylon, claimed to have exceptionally high washfastness and lightfastness.

I have not been able to find any Colour Index names for Eriofast dyes. Not all of the dyes formerly made by Ciba Specialty Chemicals have Colour Index names. For example, many of the Lanaset dyes, which are now made by Huntsman, lack C.I. names.

Erionyl dyes are available from the same source as Eriofast. They include non-sulfonated metal complex dyes and monosulfonated and disulfonated metal-free acid dyes mainly used, as their name suggests, for dyeing and printing polyamide (including nylon). The only Colour Index names I've found for Erionyl dyes are C.I. acid blue 120 for Erionyl Navy Blue G, C.I. acid red 316 for Erionyl Scarlet M2R, and C.I. acid yellow 151 for Erionyl yellow MR, but I expect that Colour Index names probably do exist for the other Erionyl dyes.





Structure of C.I. acid blue 120, from Sigma Aldritch.


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