APUG group buy DAS
This is a quick test with a 3% solution of DAS (CAS 2718-90-3) from the APUG group buy.
An unsensitized pigment tissue was brush sensitized with a 3% solution of DAS and dried overnight. It was exposed through a pair of AGFA steptablets with between each step a log 0.15 density step. Darkest step is log 2.85.
The tissue was transfered to a fixed glossy RC paper. Scan was done with an Epson 4890 with Vuescan, all settings neutral.
What can be observed is the very long and regular tonal range with a relatively low dmax. It is extra long because of the brush sensitization with a saturated solution that has a more pronounced self masking.
Hi,
With a Carbon Tissue, i will brush DAS 3%
Just two question, i begin in the future with the DAS:
1. To dilue the DAS, the best is water or other liquid ?
2. The temperature is important ? 10°c celcius (50°F) is OK or other ?
Thank you for you help
Philippe bErger
— Berger 2 07 2013 - 21:43 #
DAS should be diluted in water. A 3% solution is a saturated solution. Temperature should be cool but is relatively unimportant. I would say somewhere around 15º C. is ok. Brush sensitizing is possible but the best results are obtained with the sensitizer mixed in the tissue. A gelatin/DAS ratio of 0.06 is a good start (6 gram of DAS for every 100gr. of gelatin in your mix.
-k
— Kees Brandenburg 2 07 2013 - 22:01 #
Thank you
Philippe Berger
— Berger 3 07 2013 - 19:00 #