Artist John Sabraw uses paint made from the toxic runoff in streams located near abandoned coal mines in his abstract paintings. Chroma S1 1, by John Sabraw.Image courtesy of the artist.

Oftentimes, when construction is conducted outdoors, there's yellow markings painted on the ground. Here's what they mean when you see them.

This is the case with chrome yellow, verdigris, gamboge, and a number of the lakes. But there is a very useful corrective for this deteriorating quality of the oil, that is pure beeswax.