Jorge no offense taken. Ive tried using potassium dichromate as a contrasting agent and just hated the muddy results it gave. Im really wanting to try out pd printing to be able to adjust contrast especially with the image like the congress one you mentioned jorge.
Jorge said:I dont know if it would work, but with pt/pd sometimes people use hydrogen peroxide. This might work for you. I have to brush up on VDB, but it seems to me you could use many of the tricks we use with pt/pd. Restrainer in the developer as opposed to the emulsion. Maybe potassium chlorate instead of dichromate.
psvensson said:Nice shots! Really makes me want to see the actual prints.
Regarding contrast, I notice Wynn White's article on unblinkingeye, http://unblinkingeye.com/Articles/Vandyke/vandyke.html, mentions the use of a reducer to increase contrast after fixing. This is what I do with cyanotypes: develop, then reduce to proper contrast with an alkaline bath.
scootermm said:thanks for the reply sandy.
Im finding I prefer the method of tailoring the negative for the process as opposed to going through the numerous chemical contrast adjustment possibilities.
Im a bit of a simplist in that regards... for me at least, it seems easier to go about it in this manner. Some of my negatives end up working amazing in VDB then others dont.... still learning.
sanking said:Basically VDB requires a negative with a very high DR, at least 1.95 and sometimes higher, if one wishes to print the entire scale. As you can see VDB has a much longer ES than even straight palladium.
If you are shooting in low contrast situations most films available in 7X17 format will not give you enough contrast, no matter how long you develop. So yes, we always want to adjust the negative as much as possibole to the process, but the films that we use limit us to certain contrast range scenes in VDB much more than is the case with kallitype or Pt./Pd. This assumes that we want to capture the entire tonal range of the scene.
Sandy
scootermm said:interesting sandy... your statement "this assumes that we want to capture the entire tonal range of the scene" or the entire tonal range possible with the print.... It feels like, for me, in my limited knowledge and experience, that its more about what tonal range makes the print look how I wanted it to look when I decided to capture the scene. for instance (to use two of the prints I posted) the congressST image doesnt create the tonal range I saw and wanted at least not to its best potential. The tonal range (which may not be the full extent of the scale possible with VDB) in the peyton image does and did result in a scale I wanted and saw. The door being bright and vibrant and the shadows and mid tones being just how I saw them.
so its an interesting point you bring up sandy. lots to think about and likely lots to eventually learn and experience on my end.
sidenote: what sorts of films would, in your opinion, work better to achieve this range? films like efke 25? etc?
Ole said:Unfortunately the best film I've found for building loooooong scales in staining developers is - APX100.
Sometimes "clearing" the highlights with very dilute rapid fix saves an otherwise dull print.
When I added a pinch of oxalic acid to the mix, the contrast seemed to go up a bit.
All of the above may be wrong.
But I like your pictures!
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