Vat dyes are an ancient class of dyes, based on the natural dye, indigo, which is now produced synthetically.vat yellow,green Vat dyes are an ancient class of , based on the natural dye, , which is now produced synthetically.No.Product NameC.I.NONo.Product NameC.I.NO1Vat Yellow GVat Yellow 12Vat Yellow GCNVat Yellow 23Vat Yellow 3GCVat Yellow 334Vat Golden Yellow RKVat Orange 15Vat Orange 2RTVat ...