durning my bi millennial  fall cleaning of a a storage room here at the company i found 35lbs of BCUP-5 silver solder thats fairly oxidized and weathered.  It was stored in a dry environment but definitely not in a sealed container.   Probably been there for 25 years+ (the joys of being in the same location since 1952) is this rod useless?  it looks like silverware that's tarnished but not beyond polishing.

is it worth more than its 15% silver content?   I know new filler is around $58per lb at airgas but since i cant recall EVER brazing any brass in this shop and we're not an HVAC outfit i cant see this being any use to this organization.

since the new regime felt the need to reorganize the forums we lost our brazing and soldering forum so im putting it here.