When an artist paints with a mixture of watercolor pigment and chinese white chalk, the process is called?

When an artist paints with a mixture of watercolor pigment and Chinese white chalk, the process is called GOUACHE.

Further expounding this, it is commonly diluted with water before being applied to paper. However, Gouache is designed to be used with opaque methods of painting.

Is it even part of math

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art.