green patina

Ingredients

copper plates, vinegar, water, Arabic gum, saffron extract

Preparation Steps

Original Recipe Text

To make a patina of copper, copper plates are placed in vinegar for a month in a damp place. After removing the patina plates, its upper part is separated and pulverized, and water is poured on it by the ratio of one to ten. Then it is placed a day in a dark place away from dust. After a day, the water over it is poured out, and it is filtered and Arabic gum is added by the ratio of three to two (p. 13).

Evidence

"The result of this study was the extraction, preparation and remaking of seven main mineral colors in Persian painting."

Remarks

This pigment was replaced with a synthetic chemical compound in the book 'Golestan Honar', which refers to a combination of synthetically-produced copper and green patina due to the high hardness and low light strength of mineral malachite (p. 13).