Hi Estcrh
No not used method on chain mail
I have used on a set of French breastplates, the red rust came off leaving the metal behind rust free but platina intact, You have great control with the dry ice as it uses shock freeze to loosen the rust as well as abrasives.
I was able to leave the leather straps on the breast plate and not damage them at all. The big benifit is no mess of sand or other abrasives as the carbon dioxide just sublimes away.
Quiet expensive but I had contacts😀
Ken
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