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Spot test for chromate on aluminum?

Greetings fellow metallists - Does anyone know of a reliable spot test for the presence of chrome on aluminum. We sometimes get in parts to be re-worked - it would be good to know if they have been previously chromate conversion coated. Thanks for the help!

Victor Waldman
anodizing job shop - Oxford, Connecticut, USA
2004

I know a method as "droplet testing".

John Luk
- Hong Kong
2004

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