You know what it looks like… but what is it called?
TAKE THE QUIZ“seidlitz”
We have one entry that includes the term seidlitz.
Seidlitz powders
plural noun: effervescing salts consisting of one powder of sodium bicarbonate and Rochelle salt and another of tartaric acid that are mixed in water and drunk as a mild cathartic
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Merriam-Webster unabridged