Re: Platinum deposit

From: Ayral ^lt;[email protected]>
Date: 12/12/04-10:58:22 AM Z
Message-id: <>

I warmed it a little and everything went back into solution

Thanks to all


Ayral a écrit:

> 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.
> Philippe
> 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 Sun Dec 12 10:58:22 2004

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