calxes

In his experiments Boyle made many important observations, including that of the weight gain by metals when they are heated to become calxes.

Boyle, Robert 2008

The formula could also serve as a fondant, the medium into which one or several metallic calxes are ground to form a coloring material for use under or on the glaze. reference

The Creation of Color in Eighteenth-Century Europe 2006

Secondly, the external ulcers in scrophulous habits are pale and flabby, and naturally disinclined to heal, the deposition of fluids in them being greater than the absorption; these ulcers have their appearance immediately changed by the external application of metallic calxes, and the medicines of the article Sorbentia, such as cerussa and the bark in fine powder, see

Zoonomia, Vol. II Or, the Laws of Organic Life Erasmus Darwin 1766

Careful placement of the colors created a perception of the juxtaposed colors as a single cohesive image. reference At a more macroscopic level, the same entrapment of color was one of several goals of the varnishing stage in painting and ceramics. reference In the best analogy of all, from the point of view of many eighteenth-century investigators, the action of heat on vitreous coloring materials trapped and melted those metal calxes, exposing the color as it made them permanent. reference

The Creation of Color in Eighteenth-Century Europe 2006