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Old 3rd Jul 2022, 1:55 pm   #2
TonyDuell
Dekatron
 
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,208
Default Re: Rust on the PCB?

I don't think it can be rust, there's no iron around to oxidise. In fact it looks more like soldering flux to me, in which case it's harmless.
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