[celyn]

Hi, Can anyone help me in finding out how to change the above to white cuprous cloride to take the green stain out of old vinyl dolls.
      Regards Mike

[Bakegaku]

Well if the difference in colour is because of the attached water molecules, then it would help to dehydrate this.  Of course the only ways I can think of to do this immediately would be to heat it (bad idea) or treat it with some kind of dehydrating agent (although not quite as bad, still pretty bad)

[celyn]

Hi, thanks for that I will give anything a try.  The green staining is caused by the dolls having had earings in for the past 40 years, I am assuming that the wires were copper. we have tried various mixes and mixtures, but nothing seems to work to draw it out and i have been told i need to change the colour of it within the vinyl...   There is a bio chemist in the US who has come up with something called removezit but as I am in the UK, shipping the chemicals is not a good idea. Other ideas we have been given is a product called CLR but thats not available either... By the way if i am in the wrong section for these questions please let me know and i will move on.
      Regards   Mike

[Borek]

Just a moment...

If I understand you well your idea is to remove water from the copper compounds present in the material the dolls are made out?

If so - it won't work. Even if you will succed, copper will soon get hydrated by the water present in the air.

Better solution will be ot find out method of extracting copper from the vinyl - but it will be very difficult. Note, that the copper had many years to diffuse into the vinyl. To "suck" it out you will need either many years or you will need to heat up the vinyl to speed up the diffusion rate. Probably both approaches are more or less unacceptable.

With some luck it will be enough to remove copper from the very thin outer layer for a good visual effect. This can be probably achieved in reasonable timeframe and without risking damage, although I have no idea how to try atm.