403 Bright Pure Black Copper Process
★Use and characteristics
1.The color is black, blacker than potassium hydroxide, the film is better than dyeing black process
2. The operation is simple, easy to control.
3. Low cost when used.
4. Film thick and tough, there is a certain ability to prevent discoloration.
★Solution composition and operating conditions
1.Operation condition:
Pure Black copper agent A 500ml/L, pure black copper salt B 100-200g/L, water 500ml/L, the blacken temperature is 80~100℃, blacken time 5~60 seconds.
2.Product catalog: Pure Black copper agent A , pure black copper salt B.