Painting with wax.
Why 200 degrees Fahrenheit?
Because wax starts to discolor at higher temperatures, and, at higher temperatures wax starts to smoke (which is extremely toxic) and then, if way too high, near 400 degrees it will flash into a fire. Wax melts at 140 degrees Fahrenheit. It does not need to be hotter than that. 200 degrees Fahrenheit is the cut-off point to prevent discoloration, smoke and flash fires.
The Pancake griddle heats the board so that the melted wax stays hot and fluid.
Varying the temperature, from cooler to hotter (do not go over 200 degrees Fahrenheit) allows for effects ranging from, at very hot: watercolor like response; very cold: crayon/pastel like effects; medium hot: something like oil impasto.
I add pigments to the hot wax and mix them in the little pans then dip a brush into the pans of hot wax and paint on the board with the hot wax just like any other kind of paint. The heat keeps the wax liquid.
Ancient Art Materials - Wax Paint
(Photos taken during the creation of paintings for the Egyptian Project.)