[alt-photo] Re: potassium phosphate

[etienne garbaux]

David wrote:

>All I really wanted to know when I posted to the list was; has anybody
>made bluish tone platinum prints and if so how?

My remarks refer to the traditional develop-out Pt process (NOT Pd or Pt/Pd).

I have never succeeded in getting what I would describe as "bluish 
tone" Pt prints.  By choice of developer one can get good dead 
blacks, and sometimes even a "plum" color (which to me is a touch 
warm with a cool note).  Gold toning can also produce a plum 
color.  If you start with a dead-black Pt print and then tone in the 
right gold toner, one might even term the result "bluish," but it's 
not like a classic cold-tone silver-gelatin "bluish."

I have seen cyanotype-over-Pt prints that were definitely bluish -- 
probably just about what you want.  But I do not know exactly how 
they were made.

I understand some of the print-out chemistries have quite a range of 
possible colors.  I believe Carl Weese published some experiments in 
the '90s demonstrating the range of variations possible with the 
Lithium/Cesium "ziatype" process.

Finally, you can get whatever tone you want with either the carbon 
process or the monochrome dye-transfer process, but of course they 
would not be Pt prints.  You could do either over Pt, just as you 
could do cyanotype over Pt.

Best regards,

etienne