A high quality screen printing ink suitable for use on cotton polyester blends linen rayon and most porous synthetic fibres except nylon fabrics must be able to tolerate the maximum heat setting on an iron because after the inks have dried they will require heat fixing to make them colourfast using a dry iron on the highest setting place a cotton cloth or piece of paper between the iron and printed material and iron on each side for 5 minutes these inks are solvent free and are non toxic