Efflorescence is not a rock band. That’s Evanescence. Efflorescence is the white, chalky substance that appears on concrete, pavers, brick, and stucco. It is residue that is left behind when hard, ...

Q. Efflorescence is mysterious to many. Does it ever stop forming? My brick three-family is about 120 years old and has an exposed brick wall in the back stairwell. I have lived in the house for 45 ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...