Acid red 18/ Acid scarlet 3R C.I. 16255 CAS NO. 2611-82-7 Molecular formula: C₂₀H₁₁N₂Na₃O₁₀S₃ Packed in 25kgs Iron Drum or Fiber Drum Used for dyeing leather,wool,silk,paper,wood etc. As material for making red ink.