Royal & Langnickel foil painting by numbers is a fun project for all artists and a perfect introduction to the techniques used in glass painting. Because the outline is preprinted onto a transparency there's no need to worry about choosing a subject matter or composition it's ready to paint. Just follow the easy instructions and, upon completion, place the provided foil underlay behind your finished painting for a dazzling display you'll be proud of. Conforms to ASTM D4236. Recommended for children ages 8 and up.