New Lippman Test Results
So I have made some changes to my processing of the Lippmann Plate and the results are promising. These were based upon feedback from my initial results from Mr. Darren Green ( thanks )
I changed the developer to Formulary' GP-2, however the developer is split into a solution A and B. Solution A is all the GP-2 ingredients, except for the Thiocyanate, mixed into 1 liter of stock solution ( GP-A ). The 12g of thiocyanate is then mixed with 200ml H2O for a 6% dilution ( GP-B ). The working developer is 15ml GP-A + 4ml GP-B + 100ml H2O.
Exposure: 2min @ f/8 bright sun
9min soak in Glyaxol @ 65deg ( prev. was 6min, did not check end temp )
3min development @ 65deg ( actually I used drift 63deg start - 66deg end )
rinse 10min @ 66deg
30s soak in 2% glycerin + 3 drop LFN @ 66 deg ( 375ml total )
I was able to get much better color rendition, although the plate is rather dim. I have been told that increasing the GP-B will brighten the plate, but may alter the color.
I was also told that blue table in the previous image post was solarization. I believe that this is confirmed with the new plate as the white mailbox is turquoise & there is some turquoise in the fence. The 4 min exposure I made of this scene has a significant turquoise cast across entire image.
The right side of the image was not completely submerged in the glyaxol hardener ( me being too stingy w/ chemistry ), however it seems to show that I am getting good hardening of the emulsion with the glyaxol and it is essential to harden prior to developing.
So my next test will be shortening the exposure to 1min and 1 1/2min. And increasing the amount of GP-B in the developer.
Last edited by R Shaffer; 05-20-2010 at 12:36 PM. Click to view previous post history.