Scheele's Green, also called Schloss Green, is chemically a cupric hydrogen arsenite, CuHAsO ₃. It is chemically related to Paris Green.

What color is Scheele's green?

It is a yellowish-green pigment which in the past was used in some paints, but has since fallen out of use because of its toxicity and the instability of its color in the presence of sulfides and various chemical pollutants. Scheele's Green was invented in 1775 by Carl Wilhelm Scheele.

How do you make Scheele's green?

It was an artificial colorant that was made by heating up sodium carbonate, adding arsenious oxide, and stirring until the mixture was dissolved. Copper sulfate was then added as the final ingredient which ends up giving it its vibrant green color.