mixtion
The act or process of mixing; the state of being mixed or becoming mixed; a mixture.
archaic, countable, uncountable
Nor are there hardly any who either treat of mutation or mixtion of sexes, who have not left some mention of this point […]
In gilding, a mixture of amber, mastic, and asphalt used as a size or mordant for affixing gold leaf to wood or to distemper pictures.
countable, obsolete, uncountable
A kind of cement made of mastic, amber, etc., used as a mordant for gold leaf.
countable, obsolete, uncountable
Where it comes from
From Middle French mixtion, mixion, and its source, Latin mixtiō, from mixtus (“mixed”).
Adapted from the Wiktionary entry mixtion (CC BY-SA 4.0).