You know what it looks like… but what is it called?
TAKE THE QUIZ“leblanc”
We have one entry that includes the term leblanc.
Leblanc process
noun: a process formerly used for manufacturing soda by treating salt with sulfuric acid, heating the resulting sodium sulfate with limestone and coal, and extracting with water the soluble sodium carbonate from the dark-colored mass formed
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Merriam-Webster unabridged