Able to glow in the dark for up to eight hours after being charged by standard lighting, After Glow Chips come in three standard sizes—¼- and 1/8-inch and flakes. When the chips are applied in the floor finish system at a rate of one pound per 16 square feet, enough light will be emitted to read a book in the dark. In the light, the chips are white; in the dark, they glow bright green. Versatile Building Products Inc. 800-535-3325.