Sulfur and arsenic based solutions
The traditional method for painting brass surfaces is to oxidize them with one solution described below. The sulfur-based oxidation method is known as liver or sulfur (LIVER OF SULFUR), and a combination of polysulfide salts are used to create a layer of black or brown copper sulfur on the surface.
This method works better on copper than on rice. But its negative intrinsic factor is having strong sulfur. In addition, it has several oxide states and can form polysulfide (inactive) compounds that reduce the efficiency and useful life of the tub. In fact, in a patina operation in these baths, because of their oxidizing power and the unexpected changes that occur from one production shipment to another, they always keep some solution as a reserve because the previous solution can no longer be used (by strengthening the previous solution).
It is not possible to use it) this method is not suitable for mass production and is not recommended. Arsenic-based solutions form black arsenic oxide on the work piece and typically operate at room temperature. However, there is a significant risk of poisoning for the consumer, so it is necessary to treat it with great caution. Besides these two methods, there are other solutions that can color rice and bronze at a limited and smaller level. These methods use a variety of chemicals to create different colors on base metals and are used for exemplary work by craftsmen and not widely used.
Liver of sulfur
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