Hi all, I've just completed my first session of soldering white metal parts and I thought my results may be helpful to others doing this for the first time.   Supplies: A bar of 70'C solder from ebay.   Flux - 6% phosphoric acid.  Having looked at "White metal flux" and various articles on modelling sites I bought a litre of 75% industrial phosphoric acid rust remover for little more than a tiny bottle of flux.   I used a small glass jar, approx. 28ml