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Stains when polishing Argentium

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When I cast argentium after polishing a piece, black stains appears on the surface. I can not remove it pickling or polishing.

Where is the problem?

Adriana Cuellar
AJM - Santa Cruz, Bolivia

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This looks like fire scale. Most likely your flask was too hot or your melt was too hot or both.

Neil Bell
Red Sky Plating - Albuquerque, NM, USA

First of two simultaneous responses -- ++++++

That is fire scale, it can be removed with agressive polishing.

Marc Banks
Blacksmith - Elizabeth City, North Carolina

Second of two simultaneous responses -- ++++++

You can use a chemical solution for cleaning and Ag surface pasivation(to be maintain clean a long period!).

ALEXANDRU SAVU
SC SAVPROD SRL - Bucharest, ROMANIA

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