Procion MX Dye Soda Ash Fabric Dye Fixer are used with Procion MX dye by pre-treating fabric or being added directly into the dye bath. It is a mild alkali that promotes the chemical reaction between Procion MX fiber reactive dyes and cellulose fiber.

Soda Ash is also known as salt soda, sodium carbonate or washing soda, and is required to activate Procion MX Dye.