Step 1 : Introduction to the question "What is guanine?"
Guanine is often confused with guano, which is an accumulation of bat excrement and the dead bodies of birds, bats and seals. Guanine is a compound most commonly found in fish scales, yeast and sugar beets. The confusion comes about because of the similarity in terms and the history of guanine's discovery. It was originally found in 1846 in, you guessed it - guano! Guanine from ground fish scales is commonly used today in lipstick, nail polish and mascara to produce a light diffusing color with a shimmer effect to it. Source: Britannica.com; Mercola .com
