Re: Palladium

From: Tony McLean ^lt;[email protected]>
Date: 01/06/04-01:46:46 AM Z
Message-id: <7A387DFA-401C-11D8-B1DE-000A959FF4C0@spamcop.net>

Sandy

What evidence do you have to support your assertion that the compound
palladium II chloride is unstable in its powdered state? I can find
none!

Tony McLean

On 6 Jan 2004, at 02:44, Sandy King wrote:

> Scott,
>
> A good source is Engelhard. Current price is about $8 a gram for
> Palladium (II) Chloride.
>
> Contact information is:
>
> Engelhard Corp.
> 554 Engelhard Drive
> Seneca, South Carolina 29678
> (800) 336-8559
> (864) 882-9841
>
> Rick Clayton is at extension 4. Several people on this list report
> good dealings with Mr. Clayton.
>
> Just remember that you should mix all of the 50 grams into solution
> fairly soon after purchase because palladium (II) chloride is unstable
> in the powder state.
>
> Sandy King
>
>
>
>
>
>
>
>> Hello Jeffery,
>>
>> Thanks for the information. I had originally thought about doing
>> traditional
>> platinum/palladium prints and looking at the sensitizer formulas in
>> the
>> appendix of Sullivan and Weeses' "The New Paltinum Print", I was
>> wondering
>> if the sodium palladium chloride was a "shortcut" to the standard
>> palladium
>> solution no. 3 (being a combination of palladium chloride and sodium
>> chloride). I was also wondering about the cost difference between the
>> two
>> salts and whether it was better to buy one vs. the other (which one
>> would
>> provide a greater number of prints to the gram). If the sodium
>> palladium
>> chloride is the "shortcut" I thought it was, then the palladium
>> chloride is
>> the better buy since I already have the sodium chloride. The problem
>> was I
>> could find no mention on the net about using sodium palladium
>> chloride in
>> the sensitizer.
>>
>> If I go the route of the ziatype, which seems very likely since I
>> work with
>> other POP processes, the above is pretty much a mote point.
>> Temperature and
>> humidity are pretty stable (about 68F and 45-50%) year round so there
>> shouldn't be much deviation on those points. I plan on printing for
>> neutral
>> to slightly cool tones.
>>
>> In your opinion, are the prices Photographer's Formulary charges for
>> platinum and palladium relatively good? I was under the impression
>> that
>> palladium was about 1/4 the cost of platinum but PF has platinum at
>> about
>> $11 less than palladium. Is there a less expensive place you can
>> recommend?
>> My thoughts were to buy around 50 grams at a time to get a better
>> price.
>>
>> Thanks again, Scott
>>
>>
>>
>>
>> ----- Original Message -----
>> From: "Jeffrey D. Mathias" <jeffrey.d.mathias@att.net>
>> To: <alt-photo-process-l@sask.usask.ca>
>> Sent: Monday, January 05, 2004 5:11 PM
>> Subject: Re: Palladium
>>
>>
>>> Scott wrote:
>>> > I'm interested in beginning work with palladium printing
>>> (speciffically
>>> > Ziatype). I see that Photographer's Formulary lists Palladium II
>>> > Chloride and Sodium Palladium Chloride. Which is the prefered
>>> metal salt
>>> > and what would the differences be between the two salts?
>>>
>>> The first is PdCl2,
>>> the second Na2PdCl4
>>>
>>> The double salts of palladium are usually very hydrophilic, meaning
>>> they
>>> like to adsorb water. This can make for difficulties in weighing
>>> out
>>> proper amounts. Therefore, it is recommended to buy PdCl2 and
>>> whatever
>>> chloride salt is to be used.
>>>
>>> This brings up the second point. The type of variation on the PtPd
>>> process to which you refer typically uses the double salt Li2PdCl4.
>>> The
>>> lithium salt (LiCl2) is used. Complete directions for weighing and
>>> mixing solutions can be found in my e-guide from the link at the
>>> end of
>>> this message. One reason for the use of the lithium salt is that
>>> it is
>>> thought to help retain moisture in the coating which is important if
>>> looking to get the more neutral or bluish colors. Although other
>>> salts
>>> may be used with various effects. Another reason is that it is
>>> thought
>>> that the lithium salt helps with the printing out process. This
>>> however
>>> is more of a factor of the sensitizer used, that is ammonium ferric
>> oxalate.
>>>
>>> As you may expect the salts are interchangeable as well as the
>>> sensitizers and can even be used in combinations producing various
>>> results. However, only some of the many combinations give full
>>> printing
>>> out results.
>>>
>>> With lithium especially, note that your ambient relative humidity
>>> during
>>> coating and exposure can provide a variety of results. Also be
>>> concerned that ambient temperature plays a part. I have found the
>>> best
>> > consistency at temperatures in the low 60s F. Higher temperatures
>> can
>>> produce a variety of problems. Lower temperaturs do not seem to be
>>> a
>>> problem until low enough to cause precipitation of the solutions
>>> (something to also be concerned of with saturated solutions.)
>>>
>>> --
>>> Jeffrey D. Mathias
>>> http://home.att.net/~jeffrey.d.mathias/
>>>
>>>
>
Received on Tue Jan 6 01:46:57 2004

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