These magnificent paints are designed to look and work just like traditional oil paint, but they're a bit special. You can use them without hazardous solvents - they're happy being thinned down and cleaned up with water. They're especially good for artists who share a workspace or don't want solvents in school or at home.
Payne's Gray is a dark blue grey made from a mixture of Ultramarine, Mars Black and sometimes Crimson. It was named after the 18th c. water-colourist William Payne who created the mixture and often recommended it to his students as an alternative to plain black.
Transparency / Opacity SO