C.I. Solubilised Vat Red 34

(a) in the presence of Pyridine , with Chlorosulfonic acid treatment C.I. Vat Red 34 leuco: (b) in the Pyridine with metal (such as copper, iron, zinc, etc) and Sulfur trioxide source (such as Sulfur trioxide, Chlorosulfonic acid or Methyl chlorosulfonate, etc.) processing ?C.I. Vat Red 34. The above two kinds of situation after alkaline, filter out insolubles, remove Pyridine and salting out.

blue light red.

Standard	Ironing Fastness	Chlorine bleach	Light Fastness	Mercerized	Oxygen bleach	Soaping
						Fading	Stain
ISO	3	5	6	4	5	4-5	5