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FINDING POTASH FOR DARKENING COPPER

I DO SCULPTURE IN COPPER. TO TARNISH THIS WORK I NEED TO FIND WHERE I CAN FIND POTASH. THIS PRODUCT DARKENS THE COPPER ENABLING YOU TO SAND AND ERASE THE UNWANTED AREAS FOR THE EFFECT PIECE INVOLVED. HAVE USED THIS BEFORE AND SO FAR AM HAVING A VERY DIFFICULT TIME FINDING. PLEASE CAN HELP IT THATS POSSIBLE , COULD YOU RECOMMEND WHERE I CAN FIND THIS POTASH...

WITH THANKS,

Leslie Williams
architect - MISSISSAUGA, ONTRIO, CANADA
2004

I know little bit about patinizing but never heard anything about potash based patina for copper. Maybe liver of sulfur [on eBay or Amazon] is thing you need (melted mixture of sulfur [affil links] and potash/potassium carbonate/).

Goran Budija
- Cerovski vrh Croatia
2004

We are placing two copper strips to accent a strip of black walnut down the center of a red oak bar top. However the customer likes the look of aged or oxidized. They want to tarnish the copper before sealing the bar top to a permanent look. Any suggestions for a quick tarnish chemical application?

John baliunas
construction - oak bluffs, Massachusetts
2004

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