Functions and Uses：
1. Completely free of hexavalent chromium and specialized formulated for acid zinc and alkaline cyanide zinc.
2. GHB-89 is a black coating agent different from the ordinary nickel salt treatment.
3. Applicable to the rack plating. It can generate a homogenous glossy black appearance.
4. In combination with the sealing agent, the time white rust formed is in between 72 to 120 hours in the Neutral Salt Spray Test.