Reactive dye

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What Wikipedia says

In a reactive dye, a chromophore (an atom or group whose presence is responsible for the colour of a compound) contains a substituent that reacts with the substrate. Reactive dyes have good fastness properties owing to the covalent bonding that occurs during dyeing.

Excerpt from the Wikipedia article “Reactive dye”, under the CC BY-SA 4.0 license. Read the article on Wikipedia