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Acidified thiourea silver polish stained stainless steel sink

Dear all,

I was recently polishing my silver jewelry and when I finished I put the polish in the sink. Well my sink is stainless steel and the polish leaked out of the lid and into the sink. The silver polish contains acidified Thiourea ⇦ on eBay or Amazon [affil links] . The result is a circle (looks likes a water mark) that has appeared on the surface of the sink. What has caused this, and what can I do to remove this circle? Did the thiourea damage the stainless steel? Thanks for any help.

Nick Collini
hobbyist - Cincinnati, Ohio
January 17, 2009

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