Silly Putty 1 part Sta-Flo liquid starch 1 part Elmer's white glue* Food coloring (optional) Mix glue and starch together until it feels like a putty. If desired, add food coloring and mix thoroughly. When not in use, Silly Putty may be stored in an airtight container. * Be sure to use Elmer's White Glue, NOT Elmer's "Washable" or "School Glue." Otherwise, you'll just get Gak!