13c67163_king___White_Metals_and_Alloys__Reaction_on_Streak
[Possible Alloy] 1. platinum 2. platinum alloy with more than Pt 800 3. base alloy [Further evidence] labratory analysis [Reaction on Streak] 
No attack
[Ganoksin] Jewelry Making - White Metals and Alloys
Reaction on Streak