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How to detect if Trivalent Chromate is on parts?

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My company is replacing Hexavalent Chromate with Trivalent Chromate because of the environmental regulations. The current Chromate is yellow and can be seen on the parts from our Zinc barrel plating operation. The trivalent chromate is blueish clear. I am looking for an easy way to verify that the chromate is on the part. The hexavalent is easy to see that is it on or not on the parts. Does anyone know of a way to detect the trivalent chromate besides adding a dye?

Thank you.

Chris Aplin
Production Engineer - Maryville, Tennessee, USA

Ed. note: Please see letters 17722 and 40620, Chris.

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