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Soldering paste


#1

Hi

I am using silver soldering paste and find that some soldered parts
have some sort of black residue left around soldering. This is not
fire scale. Can’t be removed with pickle but can be easily scraped
with sharp object. I thought it was not completely melted paste and
re-heat it till solder melts again but it doesn’t go away.

Anyone has similar issues?

Any advice?
Thanks