Hey,
Following the other thread I resumed my training with the CoC grippers.
I noticed though that for some time now (more than a year probably), there is a yellowish coating on the silver side of the grippers. I tried to take a few pictures of it, not sure it shows there all too well.

Any ideas what this might be?, it surely gets my hands primal and calloused but I want to make sure it ain't dangerous.

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