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.

 

[arthur kierski]

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

rhodium plated silver?
so-called rhodium plating

Yes,silver chains plated with rh---rh flash to give a shine to the silver chain.sorry english is not my maiden language.

 

[Yggdrasil]

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.

My guess is that the Rh dissolved and created a Rh salt.
After all that is how Rhodium got its name after the vivid colors on its salts. Rhodon , rose colored.
The grey is probably the crumbled metal.
Somehow the dilute AR dissolved the Rhodium this time.

 

[anarxi]

Yes,silver chains plated with rh---rh flash to give a shine to the silver chain.sorry english is not my maiden language.

Well, English is not my native language either....

Is there such a thick rhodium plating?
or do you have a lot of coated silver?
and then what do you do with the resulting rhodium?

 

[nickvc]

I gather that chromium doesn’t dissolve in nitric so could that be a possibility for your mystery?

 

[arthur kierski]

Well, English is not my native language either....

Is there such a thick rhodium plating?
or do you have a lot of coated silver?
and then what do you do with the resulting rhodium?

The hook tool is a long copper wire , fantasy jewellery is attached to this chain(copper wire) and plated in a rh plating solution-when you plate the jewelleries,the copper wire is plated also--after repeating this plating operation,the copper wire gets plated too and thickened with rh plating- this answers your question of thick rh plating?the fantasy jwellery is silver coated pieces that you attach to the copper wire and then plate dipping the rh plating solution-- i take the resulting thick rh and puryfy ,making rh powder wich i sell as rh--or make a rh sulfate bath solution to plate more silver coated pieces--when the rh plated becams too thick ,i substitute with new copper wire.because the process stops-i think i answered your doubts with my poor english.

 

[arthur kierski]

I gather that chromium doesn’t dissolve in nitric so could that be a possibility for your mystery?

Nickvc, it is not chromium--the person,is a long time friend and would tell me. My regards to you,a good forum friend.

 

[nickvc]

We need someone , Lou or someone , who regularly processes PGMs to chime in he probably knows the answer to this mystery, l avoided PGMs whenever possible.