Reactive dye is the dye that can react with a fibre to form a covalent link, that is forming a permanent attachment in the fibre and could not be removed by repeated treatment with boiling water under neutral conditions. From: Process Control in Textile Manufacturing, 2013. Vinyl Sulfone dyes, also known as Remazol® dyes after the trademarked name under which they were first introduced, are a type of fiber reactive dye that is often used in silk painting.Reactive dyes are so called because this is the only type of dye, which has reactive group, and that reactive group reacts chemically with fibre polymer molecules and form covalent bond. ... For this reasons the dyes are so called. They are also called 'fibre reactive group'. for more info visit: https://toppostaboutreactivedyes.weebly.com/