Re: Platinum Permanency

NADO000 (LNADEAU@unb.ca)
Sat, 21 May 94 17:42:40 ADT

>On Thu, 19 May 1994, NADO000 wrote:
>
>> A platinum image is permanent, but it is a strong catalyst and can
>> affect, even destroy cellulose. A platinum print is almost like an
>> organic living thing. There have been graduate theses on this subject
>> recently in France and in the UK and these will be discussed in the
>> upcoming 3rd revision of my book on platinum printing (end of June I
>> hope)
>
>A question for Luis, or do we have to wait for his book:-)
>Is palladium susceptible to the same catalytic reactions? As well as

Nothing definite, but probably not to the same extent.

>cost, and warmer tones, is this a reason for favouring palladium over
^^^^^^^^^^^^^^^^^^^^^

and higher DMax, yes, Pd is preferable over Pt
>platinum?
>
>Would applying a thin size of gelatin on top of the platinum prevent this
>catalytic reaction? Mike Ware apparently uses a similar procedure in his

It would not prevent it, but it might slow it down. A "thick"
(relatively speaking) gel coating does protect silver images.

Luis Nadeau

>new chrysotype process to protect the hydrophobic (?) colloidal gold.
>
>Philip Jackson
>pjackson@nla.gov.au
>
>