Re: Platinum deposit

From: Ayral ^lt;[email protected]>
Date: 12/11/04-05:37:22 PM Z
Message-id: <>

Thanks to all for your explanations.
All was dissolved when prepared months ago, deposit is quite new, just
few weeks ago.
I will try to warm it up and see what happens.


Jeffrey D. Mathias a écrit:

> Ayral wrote:
>> I found some deposit at the bottom of my platinum bottle (Pot.
>> Chloroplatinite )
>> Should I leave it like that or is there a way to dissolve it again.
>> Shaking the bottle doesn't work.
> There may be a couple possibilities even for those who are careful and
> clean.
> a) It is K2PtCl4. Depending on the solution strength and the
> temperature there may be some deposit. This is OK and normal. What
> needs to be done is to warm the solution before and during use in a
> warm water bath that is at the temperature to keep all the metal salt
> in solution. "However it is recommended to not go warmer than 140F.
> It is normal that typical Pt solutions will require a temperature
> greater than the room. [Note: It is not recommended to warm the room
> as the coating process in general seems to work better around 60F.]
> If the deposit is present and not in solution then the coating may not
> have enough Pt and the print will be weak. It is very unlikely that
> this will produce black specks as this double metal salt is soluble in
> water and will wash off during processing.
> b) It is K2PtCl6. This is bad as this salt is only slightly soluble
> in water and no amount of warming or shaking will help. Although this
> can be formed at temperatures over 140F in the presence of sodium, the
> likely source is contamination or an impurity of the raw double salt.
> This is from the manufacturer. This can be a cause of black specks in
> the print.

Philippe Ayral
52, rue de Vallard
74240 Gaillard
Tél/Fax: +33 (0)450 39 79 81
Received on Sat Dec 11 17:37:25 2004

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