It is a fungus. The wall is getting moisture in it from somewhere.
The japanese put white plaster on the walls because it is fireproof
You drain the water then plaster the walls from inside
does it cover repairing plaster walls and repainting and fixng plumbing
Stucco
They really shouldn't, it is toxic.
Just paint it white!!
stucco
Frescos are painted directly onto damp plaster on walls.
There are a couple types of plaster that can be used for interior walls. One form of plaster is lime plaster; it is made up of calcium hydroxide and sand. Cement plastic is a mixture of sand, water, portland cement, and suitable plaster.
Aggressive water chemistry and age.
A fresco is created by painting colored pigments (oil, traditionally) into wet plaster.
You can use a heavy paint or plaster to get a sort of wavy effect.