hook tool full of ag and rh used to plate fantasy jewellery.

[arthur kierski]

I have ahook tool full of ag and rh --I deplated this hook with nitric acid and dissolved the ag,who became a solution of agno3--I filtered the solution and the rh precipitated went to the fiter paper--i treated this rh with dilute ar(hoke book sugestion)and formed a redish rh powder instead of grey rh powder--I many times extracted and purified rh and the powder had a grey collor.Can someone tell me why my rh powder became a reddish pwder? thanks for all opinions.

 

[anarxi]

rhodium plated silver?
so-called rhodium plating

 

[nickvc]

Perhaps your customer found a cheaper alternative to using rhodium , maybe dissolve a little of the powder and do a stannous test.