Synthetic Copper Carbonate Hydroxide, (the naturally occurring mineral is called Malachite). There are a wide variety of colors from teal to green that can be achieved synthetically. Natural Malachite shows variety in color according to the natural source and also according to how finely that source has been ground, so there is a great deal of variety depending on the supplier. Sometimes PG39 is sold in grades depending on the fineness of the grind (for example, fine, medium and coarse) with fine grades being lighter and medium grades being darker greens.
Is a historical pigment which can be a little bit difficult to find as an oil paint. Natural pigments at one time sold malachite in oils. It is fairly straightforward to mix an approximation for the masstone color. The degree of grinding matters with malachite as finer grinds will become lighter and less chromatic. Listed as toxicity B, meaning it does have toxicity.
