So long as "Spring silver is Sterling silver that is hardened to
give it the “spring” needed for items such as money clips
then there shouldn’t be a problem. My instructor (Ken Valen) did
receive Sterling Silver in a hardened state from one purchase, and
when he soldered and quenched it it tore… not something he could
regularly duplicate by any stretch of the imagination, but I would
recommend annealing the stock unless using only cold connections.
Have fun,
K. David Woolley
Fredericton, NB
Diversiform Metal Art & Jewellery