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Grey scum on copper pieces after tumbling.

by Jane
(British Columbia, Canada)

I have just started using copper with my lampwork beads, and when I tumble the pieces I get a grey scum in all the crevices, which I have to brush out with a brass brush. It is very time consuming, and I can't always get it out due to some of the designs. I am using a Lortone 3A tumbler with steel shot, water and shaved ivory bar soap. Do you have any insight into my problem? Thanks!
Your pieces are absolutely stunning, and I hope to own one of them one day.

Jane P.

Stacy's Answer:


Hi Jane!
I agree with you that having to hand-polish your copper after removing it from the tumbler would be very time consuming and a pain! First off, I would change the soap that you're using to tumble your pieces in. Here in the States, we use Dawn dish soap, but you can probably use another liquid dish soap, as long as it does not contain any perfumes, dyes, abrasives, etc. You should not get a "grey scum" on the copper! Try running your tumbler with only Stainless steel shot, a squirt of dish soap and enough water to cover say 1/2 inch over night to thoroughly clean your shot and the rubber tub.

I've written an article you can find here, JewelryLessons.com, in the "Articles Section" that discusses in some detail all you may wish to know about tumbling. (you'll need to sign up, but there is no cost and I think you'll really enjoy the site!)

Please let me know how is goes!! Thanks for your question!
Happy wiring!
Stacy :)

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Grey scum on copper pieces after tumbling.

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Jul 02, 2009
Grey scum on copper
by: Jane

Thanks Stacy,
I have already run the tumbler with just the shot, water and soap - in fact I did it for two days. The water was quite dirty after the first day, so I changed it, washed the shot, and ran it again. I am going to try changing the soap, and hopefully that will help.

Jul 06, 2009
No more grey scum!
by: Jane P.

I have done several experiments, and the results are that I have now changed from shaved Ivory bar soap to the Dawn blue liquid - and presto, no more grey scum. I guess the combination of my water, LOS'd copper and the Ivory just was not a good one. The Dawn has made all the difference.

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