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1. (WO2013122774) COLOR CONTROL OF TRIVALENT CHROMIUM DEPOSITS

Pub. No.:    WO/2013/122774    International Application No.:    PCT/US2013/024719
Publication Date: Fri Aug 23 01:59:59 CEST 2013 International Filing Date: Wed Feb 06 00:59:59 CET 2013
IPC: C25D 3/06
Applicants: MACDERMID ACUMEN, INC.
Inventors: HINGLEY, Stacey
TOOTH, Richard
CLARKE, Terence
Title: COLOR CONTROL OF TRIVALENT CHROMIUM DEPOSITS
Abstract:
A method of adjusting and controlling the color of trivalent chromium deposits is provided. The method includes the steps of: (a) measuring the color of a trivalent chromium deposit standard; (b) adding one or more color enhancing additives to a trivalent chromium electrolyte; (c) contacting the substrate with the trivalent chromium electrolyte containing the one or more color enhancing additives to deposit trivalent chromium on the substrate; (d) measuring the color of the color-enhanced trivalent chromium deposit; (e) comparing the color of the color-enhanced chromium deposit to that of the standard; and (f) if necessary, adjusting the amount of the one or more color enhancing additives added to the trivalent chromium electrolyte if the color of the color-enhanced chromium deposit is outside of a desired optical variation from that of the standard color-enhanced chromium deposit. The color of the trivalent chromium deposit may be measured using a spectrophotometer.