Green patina

Ingredients

Copper plates, Vinegar, Water, Arabic gum, Saffron extract

Preparation Steps

Original Recipe Text

Copper plates are placed in vinegar for one month in a damp environment. The resulting patina is separated and pulverized. Water is added in a 1:10 ratio. The mixture is placed in a dark, dust-free area for 24 hours. The water is then poured off, and the residue is filtered. Arabic gum is added in a 3:2 ratio (p. 13).

Evidence

"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."

Remarks

The text notes that natural malachite was often replaced by this synthetic copper patina in sources like the 'Golestan Honar' because malachite has low strength against light and high sensitivity to acid (p. 13).