ʻO pigment fluorescent UV ihokala ʻole, a ma hope o ke omo ʻana i ka ikehu o ke kukui ultraviolet (uv-365nm a i ʻole uv-254nm), hoʻokuʻu koke i ka ikehu a hōʻike i kahi hopena fluorescent kala. Ke wehe ʻia ke kumu kukui, kū koke ia a hoʻi i ke kūlana ʻike ʻole ʻia.