beerstone
nounEtymology From beer + stone.
1
A precipitate of calcium oxalate and related organic compounds which forms in brewery vessels and other equipment for handling and serving beer.
- Beerstone is a composite coating of protein and calcium oxalate that is more difficult to remove than typical hard water limescale.2017, John J. Palmer, How To Brew: Everything You Need to Know to Brew Great Beer Every Time: