If using in Stained Glass, apply Flux and patina carefully, as they may stain the glow. It's recommended to utilise blue painter tape on areas you want to protect or apply a few thin coats of rubber cement. Detergent and a toothbrush will remove most stains as long as applied quickly. This product acts similarly to Dichroic, iridescent glass and Mica. It doesn't spread. The Strontium Aluminate used to make the glow in the dark aspect is non-toxic; however, if you need to ensure an item is food safe, always cap with clear. Use glue sparingly, as it will reduce your final effect. Cut on the smooth side to get a better piece