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@botvolution

Good question!

I used to have a supplier on eBay that had really inexpensive but top quality Polish (as in the country) solder, but that ended many years ago - Cynel iirc.

Since then I have used Kester SN63PB37 - the naughty but good stuff - I still have 1/2 a lb of that left!

But also have an as yet untested roll of Stannol Cn96,5Ag3Cu0,5 which is meant to be lovely according to Exploding Shed anyway 😃

Both look Shiny!