We have started trying out alternative paints. First up is casein paint. This is a highly breathable paint free from VOCs, acrylics, oils and solvents. It comes as a powder which you mix with water. Two coats are recommended and it is more expensive than limewash per coat but less expensive than earthborne clay paint. The paint produced a nice mat finish but it did not fill into the cracks in the lime plaster, but sat on top similar to a more conventional paint.