1.Co2+ （in the solution） ≤0.5g/L,the layer is black and beautiful，it can reach the extreme limit of cobalt（1ppm）of Oeko-Tex Standard.
2. This process can be plated fast and the throwing is good.，the plating solution is simple and the operation is very easy. low cost, no needle detector beeping
3. The deposits is soft and the adherence is good, the effect of drawing and light gun color is perfect. It’s not easy to fade .
1.Make up method：
makeup agent solution, adding nickel free gun tin salt 0.7-0.8g/L stirring and dissolving, adjusting PH to process, heating to 40 ℃, you can produce.
2. Operation condition:
Plating baume25-35Be0，， PH（ph test paper）10-12，temperature35-45℃。
1000AH consumption addition，Taking zinc alloy zipper head as an example：Adding black agent 1kg, auxiliary agent 3kg, nickel free gun tin salt 20-26g.
3. Product catalog：
Makeup agent, blacken agent, assistant agent , nickel-free gun tin salt, black salt.