The H Dupont Classique Silk Dyes are formulated from Acid dyes. The dyes are suspended in a solution and are made ready to paint with. Dupont dyes give the most vibrant colour results when painted on silk fabric and are set using the heat from steam. You learn about how to steam set dyes from our Blog post. Use a gutta outliner to prevent colours from running into each other or a primer to treat the silk fabric prior to painting it. Primer (or anti-spread) will slow the spreading of the dyes and give the impression of water colours on paper. A very popular choice for silk painting.