Colourcraft Silk Flow+ is a versatile and permanent concentrated liquid colour for use on silk and other natural fabrics. The inter-mixable fade resistant colours produce outstanding effects on silk but also work well on cotton, velvet, Evolon etc as well as on other porous surfaces such as paper, card, wood and leather. Silk Flow+ is ideal for all types of silk painting including with gutta, layering colours, tie dye, sponging, airbrushing and resist techniques. Heat fix by ironing on reverse side of fabric for 2 minutes. Silk Flow+ is water-based, non-toxic, acid free and free of solvents, oil and volatile organic compounds.