Discover amazing white colour gel crayons that reveal their true colours on black paper only.Mystery metallic gel crayons are smooth to draw with, leave a metallic sheen and quite frankly are amazing.The gel crayons are made with a waxy gel that appears white, but once you lay the gel crayon on black paper they leave a metallic sheen in 6 incredible colours including Purple, Red, gold, white, Green and Blue.You'll find that mystery metallic are amazingly smooth to colour with and make a great artistic tool for kids and adults alike.