What is "stereochromy"

Stereochromy \Ste`re*och"ro*my\, n. [Stereo- + Gr. chrw^ma color.] A style of painting on plastered walls or stone, in which the colors are rendered permanent by sprinklings of water, in which is mixed a proportion of soluble glass (a silicate of soda).

n. The painting of murals using pigments mixed with water glass