Reactive dyes are commonly used in three primary colors: 3BS red (C.I. Reactive Red 195)
Reactive Red 3BS, Reactive Red M-3BE, Reactive Red M-3BF, Reactive Red SP-3B, Reactive Brilliant Red ME-3BS, etc.
Molecular formula: C31H19ClN7Na5O19S6
Molecular weight: 1136.32
Structural formula: Reactive red 3BS has two isomers, generally referred to as the meta-ester C.I. Reactive Red 195, and some is the para-ester C.I. Reactive Red 241 (241 price is several times 195).