As early as 2005, with EU's legislation of RoHS, HSCT began to research an environmentally friendly trivalent chromium electroplating processes. Since 2008, such an effort has blossomed and yielded fruits. HSCT's trivalent chromium electroplating additives have come into the market under the trademark Unimirror®, including both for the white chromium plating process and for the black chromium plating process. After almost two decades of upgrading, these products have won very high reputation and market share for their incomparable stability. Unimirror® TVC is formulated for electroplating white color trivalent chromium deposits. While, Unimirror® BTVC is formulated for electroplating black color trivalent chromium deposits. And, Unimirror® TVC-RIP is specially formulated for purifying the impurities in the trivalent chromium electrolyte which is very easily polluted by metal ions. There are many remarkable merits applying Unimirror® TVC-RIP in the trivalent chromium electrolyte, such as: 1) removes impurities effectively, fast and completely; 2) does not affect the quality of the plating process; 3) removes on-line, there is no need to interrupt the plating production; 4) can be used either in hydrochloric acid type electrolyte, or in sulfuric acid type electrolyte.