Functions and Uses：
1. THB is an attractive glossy black decoration applied to the nickel deposit.  It is treated as a routine black chrome plating process.
2. THB has a particularly excellent function in the process of trivalent chromium deposition.

Operating Components：
THB-D conductive salt     250g / L
THB-MU make up            10mL / L
THB- A supply A                500ml / KAH
THB-B supply B                400 ~ 600ml / KAH
THB-C supply C               1000ml / KAH
THB-SR humectant          2mL / L
PH                                       3.4 to 3.8
Temperature                     50 ~ 60 ℃
Time                                   2 ~ 5min
Current density                 5 ~ 10A / dm2