Sorry if the chemistry flair is incorrect, just sounds about right for something like rusting and reactions.
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[https://imgur.com/a/wrfE0RR](https://imgur.com/a/wrfE0RR) I don’t know if images work in comments, so here’s a link to what I mean. It’s shown on concrete, but I see this happen with metal too.
When I I’m not familiar with the term do you have a picture you could share?