Etymology
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calomel (n.)

old name for mercurous chloride, 1670s, from French calomel, supposedly (Littré) from Greek kalos "beautiful" (see Callisto) + melas "black;" but as the powder is yellowish-white this seems difficult. "It is perhaps of significance that the salt is blackened by ammonia and alkalis" [Flood].

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Definitions of calomel

calomel (n.)
a tasteless colorless powder used medicinally as a cathartic;
Synonyms: mercurous chloride
From wordnet.princeton.edu