I am a frame builder AMA

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deleted in reply to @M_V

I just use boric acid off ebay for brass. Dirt cheap and works fine. Your silver flux will cook before you get up to temp so you will need something different either way.

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jdmitch in reply to @deleted

Just something cheap like this or do you look for ones that advertise as flux (borax?)?
Do you mix with de-ionised water or denatured alcohol (like this?) to make a paste?

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deleted in reply to @jdmitch

Just the standard stuff and council juice to paste it up. I've been using it for years, as have most of the old boys of frame building. Got onto it after Winston Vaz did a lol when he heard how much I spent on the cycle design stuff.

https://www.ebay.co.uk/itm/Boric-Acid-99-9-Pure-Kills-Ants-Fleas-Cockroaches-Silverfish-FREE-Postage/122072318886?hash=item1c6c13c3a6:m:m5XgIxBB7KiqSCXCQQEvaow

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