1) Alchemical substance 2) Iron oxide pigment
Found on
https://www.crosswordclues.com/clue/caput-mortuum
Caput Mortuum (plural Capita Mortua) is a Latin term whose literal meaning is `dead head` or `worthless remains`, used in alchemy and also as the name of a pigment. ==Alchemy and chemistry== In alchemy, Caput Mortuum (alternately called nigredo) signified a useless substance left over from a chemical operation such as sublimation and the epito...
Found on
http://en.wikipedia.org/wiki/Caput_mortuum
Caput mortuum is Latin for a dead head. It was a fanciful term much used by the old chemists to denote the residuum of chemicals when all their volatile matters had escaped and hence, the term came to be used for anything from which all that rendered it valuable has been taken away.
Found on
http://www.probertencyclopaedia.com/Y.HTM
No exact match found.
