There are four categories of “glow.” Bioluminescence is, say, a firefly. There’s chemiluminescence, caused by a chemical reaction—think glow stick. Radioluminescence is most frequently used in clock or watch paints and on instrument panels. Then there’s phosphorescence, frequently used in toys, or toys for grown-ups: knives, or more specifically knife handles. The old-school invisible type … Continue reading 6 Knife Handles That Glow In The Dark