tutty
Noun
Meaning
A yellow or brown amorphous substance obtained as a sublimation product in the flues of smelting furnaces of zinc, and consisting of a crude zinc oxide.
Source: Webster's dictionaryExamples
Craddock and Eckstein 2003, 226 Albertus Magnus noted that the "power" of both calamine and tutty could evaporate and described how the addition of powdered glass could create a film to bind it to the metal.
Craddock and Eckstein 2003, pp. 224–5 Islamic cementation seems to have used zinc oxide known as tutiya or tutty rather than zinc ores for brass-making, resulting in a metal with lower iron impurities.