13c67163_king___White_Metals_and_Alloys__Reaction_on_Streak
[Possible Alloy] 1. silver alloy 2. platinum - silver alloy 3. base alloy [Further evidence] silver test [Reaction on Streak] 
Dissolution without residue and without the acid being colored yellow
[Ganoksin] Jewelry Making - White Metals and Alloys
Reaction on Streak