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, ...

We may receive a commission on purchases made from links. If you've noticed a white, powdery substance on a surface in your home, you may accidentally mistake it for mold at first. However, upon ...