Flexon powdered fabric dye are concentrated dyes which are permanent, colorfast and washable.Typically, a 20 gm bottle can dye more than 3 kg of fabric.Permanent Fabric Dye will not fade or wash away over time.it can be used for Silk,nylon, wool fabrics. Instruction are given in side the leaflet provided.Ideal For: Boys and GirlsMaterial: SILK, WOOLLEN, NYLONAge: 12+ YearsBrand Color: BlackMinimum Age: 12 yearsWidth: 8 cmHeight: 2 cmDepth: 5 cm: The color of some product parts may vary from what is shown in the image.