dichromate tuning chart

These are all of the old posts from the first two years of the forum. They are locked.
Updated: 2005-03-28 by HoloM (the god)
Danny Bruza----helpful hi

dichromate tuning chart

Post by Danny Bruza----helpful hi » Wed Dec 24, 2003 1:17 pm

dic-gel recording wave
10-30 514nm 532nm 405nm
09-30 533nm 552nm 424nm
08-30 552nm 571nm 443nm
07-30 571nm 590nm 462nm
06-30 590nm 609nm 481nm
05-30 609nm 628nm 500nm
04-30 628nm 647nm 519nm
03-30 647nm 666nm 538nm
02-30 666nm 685nm 557nm
01-30 685nm 704nm 576nm

its just a chart i made for my self

anon

dichromate tuning chart

Post by anon » Sat Dec 27, 2003 3:54 pm

Danny,
Could you be more specific:
"10-30 514nm 532nm 405nm"
in the above line, the 10-30 is the ratio of dichromate to gelatin. But what do the wavelengths 514, 532 and 405 signify? which one's the recording wavelength, and which one the playback wavelength?


Danny Bruza----helpful hi

dichromate tuning chart

Post by Danny Bruza----helpful hi » Sat Dec 27, 2003 4:43 pm

dic-gel recording wave
10-30 514nm 532nm 405nm --this mixer plays back at recorded wave length----- then the amount of water selects band wth.......narrow band 150-250 water broad band 300-350 then as you bring down the grams of Dichromate it shifts color
09-30 533nm 552nm 424nm
08-30 552nm 571nm 443nm
07-30 571nm 590nm 462nm
06-30 590nm 609nm 481nm
05-30 609nm 628nm 500nm
04-30 628nm 647nm 519nm
03-30 647nm 666nm 538nm
02-30 666nm 685nm 557nm
01-30 685nm 704nm 576nm


Colin Kaminski

dichromate tuning chart

Post by Colin Kaminski » Sun Dec 28, 2003 1:01 am

I am not sure I understand either. So all of the recording wavelengths are 532?

Then in 514 532 405 what are the 514 and the 405?




danny bruza

dichromate tuning chart

Post by danny bruza » Sun Dec 28, 2003 1:06 am

514... is the green line that argons give out....and 405 is that new ati uv laser moduel

Martin

dichromate tuning chart

Post by Martin » Sun Dec 28, 2003 6:44 am


"dic-gel recording wave
10-30 514nm 532nm 405nm --this mixer plays back at recorded wave length-----
then the amount of water selects band wth.......narrow band 150-250 water
broad band 300-350 then as you bring down the grams of Dichromate it shifts
color"

It's my understanding that your chart will only work with the specific
gelatin and processing scheme you are working with. Hence it will greatly matter if you change gelatin bloom strength, concentration, hardening etc.
Layer hardness appears to be pretty important. Having done some DCGs (at 532 nm) on old 8E75 and PFG-03 emulsions, I always ended up with green reflection holograms no matter what am. dich. concentration I used.

Apropos gelatin hardening, little importance has been attributed to the hardening agents. Since most people seem to use Kodak hardening fixer, it might be interesting to note it is based on aldehydes. Somewhere I found this:

"PREHARDENER AND REPLENISHERWater at 35 to 38ºC (95 to 100ºF)850 mL
Succinaldehyde-bis-bisulfite
(KODAK Hardening Agent HA2)
Succinaldehyde Disodium Bisulfite10.00 grams
Sodium sulfate, anhydrous (desiccated)147.00 grams
Aminoacetic acid
(KODAK Solubilizing Agent SA-2) (Glycine)1.00 grams
Sodium bromide2.00 grams
Sodium acetate, anhydrous15.00 grams
Formaldehyde, 37% solution (12% methanol)28.35 grams
Acetic acid, glacial STIR FOR 5 MINUTES; THEN ADD5.24 grams
Water to make1.00 litre

The pH or prehardener and replenisher is 4.80 ± 0.10 at 27ºC (80.6ºF).
The specific gravity is 1.136 ± 0.003 at 27ºC (80.6ºF).
Note: Fresh replenisher is colorless, but the solution turns dark purple after standing.This does not have any adverse photographic effects."

By the way, I was wondering about your microwave step. If I am not misled you said to apply it ca. 10 min. after coating. I would think this is by far too early. The gel containing lots of water will be boiled in the microwave oven. I'd rather suggest to have the layer dried for a couple of hours prior to the microwave treatment.

Colin Kaminski

dichromate tuning chart

Post by Colin Kaminski » Sun Dec 28, 2003 1:52 pm

Now I understand. Can one shift towards the blue?

JohnFP

dichromate tuning chart

Post by JohnFP » Sun Dec 28, 2003 4:36 pm

Merry Christmas to all!!

I believe what Danny is stating with this chart is the following;

dic-gel recording wave
10-30 514nm 532nm 405nm
09-30 533nm 552nm 424nm
08-30 552nm 571nm 443nm
07-30 571nm 590nm 462nm
06-30 590nm 609nm 481nm
05-30 609nm 628nm 500nm
04-30 628nm 647nm 519nm
03-30 647nm 666nm 538nm
02-30 666nm 685nm 557nm
01-30 685nm 704nm 576nm

At 10-30 the playback wavelengths are costant with what the recording wavelength was, that is 514 replays at 514, 532 replays at 532 and 405 replays at 405. Then if you decrease the dichromate concentration to 09-30 the 514 recording wavelength replays at 533, the 532 at 552 and the 405 at 424... and so forth.

Martin, you are correct. There are so many variable that affect the final playback wavelenth that these stardard would only be accurate it all other variables were maintained with with this chart was created.

I for one know that I can change the playback wavelength simply by modifiying the concentration of the 2nd of my four alcohol baths.

Also, the exposure duration will affect the final playback color.

I think Danny simply stated this is a chart for himself that allows him to have a base line for controlling the wavelength as a function of ADC concentration.

danny bruza

dichromate tuning chart

Post by danny bruza » Mon Dec 29, 2003 2:50 pm

i have found that this chart is a good refrence of the degree of shift of color....even when i change bloom lets say 275 to 225 ...i still get near red at
(03-30) then depending on the water will determan my bandwith.....i made this chart to help me and also to see if using the uv laser diode by ati would be able to tune to the visable wave lenghts
10-30 514nm 532nm 405nm
09-30 533nm 552nm 424nm
08-30 552nm 571nm 443nm
07-30 571nm 590nm 462nm
06-30 590nm 609nm 481nm
05-30 609nm 628nm 500nm
04-30 628nm 647nm 519nm
03-30 647nm 666nm 538nm
02-30 666nm 685nm 557nm
01-30 685nm 704nm 576nm
and as you see the 405 diode can get into the visable wave lenghts for play back

danny bruza

dichromate tuning chart

Post by danny bruza » Mon Dec 29, 2003 2:55 pm

its kinda funny.. but the over exposed or too much hardening will shift toward a blue playback....i dont quit understand why but it does

Locked