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What is the main ingredient formula of blackening agent for copper in the market?

The main components of copper blackening agent at room temperature are sodium sulfide, potassium sulfide, copper sulfate and oxalic acid. Copper is a heavy metal, which is toxic to people. Scope of application: Special blackening agent for brass is suitable for blackening brass of H59 and above.

Copper room temperature blackening agent product composition:

It consists of blackening agent and blackening assistant, which are mixed before use. According to the blackening agent: blackening assistant =1kg: 60 g.

Instructions for use of copper room temperature blackening agent:

① Brass pretreatment: degreasing, derusting or polishing.

(2) Mix the blackening agent according to 60g/kg, stir evenly, then let it stand for 5 minutes, and take the supernatant for blackening treatment.

(3) Soak the brass for 5- 10 minute, and gently rotate the workpiece during the soaking process.