Submitted by Kwiercyski t3_127ss0a in mildlyinteresting
Kwiercyski OP t1_jefninx wrote
Reply to comment by dragon1n68 in When a nail is hammered into an oak tree, it sends a blue vein up the wood. by Kwiercyski
I guess. I also thought it might have something to do with the metals itself. Like I know Chrome makes blue compounds
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