Note: Howlite and Magnesite beads ARE DYED and they can bleed. Always check your seal by using a damp cloth, if bleeding occurs you can seal your beads before use by spraying them with a craft sealant. Problem colors are sometimes purple,dark green, and red. Bleeding is caused by sweat, water, perfume, lotions, and the deterioration of the seal over time.This is not the case for all beads and is not a common occurance but can happen.