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Remazol dyes are a brand of vinyl sulfone fiber-reactive dyes that are used on animal fibers like silk and wool and also on cellulose/plant fibers, like cotton and hemp. Since the bonds they form may successfully be chemically resisted with the use of resists, they are also used in printing applications where the color will fix to the print area only and not the underlying fabric.

Remazol dyes are less reactive than Procion dyes, and thus require more heat for the bonding of dye to fabric to occur (they must be applied at temperatures higher than room temperature) and also may be stored as solutions in water (since they are essentially non-reactive until exposed to alkaline pH, unlike Procion dyes). They are more susceptible to washing out than some other fiber-reactive dyes

For more information, see DyStar's Remazol Ultra RGB page and the EMU Dyes and Dyeing Glossary: A Glossary of Terms for Materials and Processes in Textile Dyeing for Artists.

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