These decals have a clear cover coat making them suitable for fired ceramics, mosaic tiles, porcelain, glass and jewelry or for non-fired applications such as wood, candles, soap, plastic, lampshades, and so much more. Decals have a semi-transparent quality which means they will show up better on light colored items. Easy to use...soak in warm water for 30 seconds or so until decal slides easily off the paper backing...slide onto object, gently remove water and/or air trapped beneath decal. Let dry 24 hours. Kiln fire or apply 2 to 3 light coats of a clear sealer. Please note that decal colors may mature during kiln firing becoming brighter and showing more depth than unfired decals.