Product Features Use the trivalent chromium passivation blueing agent, when you feel that blue-white glossy is not enough after blue-white passivation with trivalent chromium. Hexavalent chromium blue-white effect can be obtained or exceeded, when you use trivalent chromium passivation blueing agent It is mostly suitable for small hardware parts, standard part. The trivalent chromium passivation blueing agent will not affect salt fog test, and keep color unchanged for a long time. This plating technology, Han Lin may have declared national patent, please use it correctly.