Dichroic glass does not use paints, dyes, or any other kind of coloring agent to generate its dazzling color. It is created by depositing vaporized metal onto sheets of glass, producing gorgeous beads with vibrant color and an oily iridescence. The vaporized metal settles as floating dust, coating the surface of the bead’s glass. The coating bends light, reflecting it exactly as a prism makes rainbows. When looking at the glass, it appears to have more than one color at the same time, especially when viewed at different angles. This reflective phenomenon is known as thin-film physics, which is also responsible for the swirling rainbow patterns in soap bubbles, oily water, and dragonfly wings.
To prevent buildup and bring back the clarity of the glass, wipe with a lint free cloth dampened with glass cleaner or rubbing alcohol.