Hair Color and Tint Mixing Bowls, Shakers, Caddies... Hair Color and Tint Mixing Bowls are glass or plastic bowl for mixing the dye and developer in. This is where you will combine your hair dye products, and what will keep it all contained. Never use a metal bowl as it can oxidize the dye, meaning your hair color might not change. Metal bowls can also cause hazardous chemical reactions. Color mixing bowls is kinda our thing!