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by jaclaz 1149 days ago
You don't really need "rosin flux", the idea is to remove oxidation, chloridric acid is what was used for tin soldering, "saturated" with zinc.

https://en.wikipedia.org/wiki/Zinc_chloride#As_a_metallurgic...

Though I have no idea if either can be found locally.
1 comments
MisterTea 1149 days ago
> Though I have no idea if either can be found locally.

Which is specifically why I mentioned rosin. Though any acid could likely be used so citric acid or something that could work as well.

link
jaclaz 1148 days ago
Yep, but I don't think that just acid is good enough.

Choridric acid + Zinc was traditionally used in tin (but lead isn't so much different) soldering/brazing, particularly of copper and brass because the Zinc had some role in the chemical reaction, AFAIK.

link