hoolligan1938
spending too much on rocks
Member since January 2022
Posts: 253
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Post by hoolligan1938 on Dec 29, 2022 14:45:35 GMT -5
I have some black onyx that has a lot of rust colored stains and lines in them. Is this possibly iron stain? Does anyone think that "Iron Out" would be safe to try on this or is there a better suggestion. I tried to smooth and polish a few of the smaller pieces but the rust colored areas seem very soft and poreus and do not shine like the onyx. Your ideas are welcome.
Jim
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,637
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Post by QuailRiver on Dec 29, 2022 14:50:46 GMT -5
A lot of black onyx is dyed or otherwise treated. So if this is the case with yours then Iron Out might remove even more of the black color. I would suggest just testing a piece or two before soaking the whole batch.
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