From: TERRY KING, 101522,2625
TO: Keith Schreiber, INTERNET:KEITH@ccp.arizona.edu
DATE: 09/02/96 11:10
RE: Copy of: Re: paper test data for palladium
Hello Keith
Double Coating
I find that I can get a brightness range of eight stops onto the film and then
onto the paper with one coat of size and a single coat of platinum/ palladium.
This is sufficient. Although more steps are possible, detail in the shadows
beyond this level is only discernible if the print is held obliquely to the
light. I use a 1% size of gelatine at $25 for 5 kilos which is a bit cheaper
than palladium for the first coat.
Desitometry
Once, when a well known pundit on silver gelatine printing told me that
densitometer readings demonstrated the inherent superiority of the medium over
platinum, I asked a number of non photographers to make a comparison of silver
gelatine blacks, far more black on the densitometer, with platinum blacks.
Without exception they chose the platinum.
Contrast control and colour
I'll explore the sodium dichramate. If you use a small proportion of platinum in
the mix and control the humidity, a wonderful split in colour and tone can be
obtained.
GP Inveresk.
GP inveresk manufacture Saunders Waterford at St Cuthberts Mill, Wells
Somerset, BA5 1AG. England. Fax 01749 78844. They also make Bockingford. When I
spoke to them this morning they told me that GP stands for Georgia Pacific ! The
company has now been sold and is now Inveresk plc. They will post sources.
Cyberspace
I have now 'forwarded' my note of 5 February to multiple recipients. Could you
let me know if you do not receive it.
Humidity
As I look across the park to where Tennyson and Julia Margeret Cameron may have
had tea together in Montpelier Row, its raining with eight eighths cloud cover.
We don't have many problems with humudity.
Terry King 101522.2625@compuserve.com