mc wrote:

Given that it's desirable to do repairs with the same type of solder as was
used originally, in order to avoid alloy mixing or partial melting
problems...

(1) How do I recognize lead-free solder when I see it?

Gawd knows mate. The politicians probably didn't think of that one.

(2) What temperature should I set my iron to, when working with SnSb or SnAg
solder?

About 50C higher. Hang on, you said " SnSb or SnAg " ! Where do you think you're
going to find those ?

Graham