Does flux go off?, I've just been trying to silver solder something with good quality silver solder that I bought a while ago, using some flux given to me by a silversmith that I've used before with good results but now (it's powder) it seems to have become humid and a bit gummy and anyway doesn't seem to work and doesn't burn away,it leaves a white residue, I cleaned the bits very carefully and also used an acid from the same place I got the solder but it just won't flow!,I always used the flux before making a paste with a little water and it worked fine ??? I don't know what's going on!
any thoughts?
Giles
any thoughts?
Giles