From: Breukel, C (cor@lumc.nl)
Date: 09/18/01-05:42:19 AM Z
(sorry if this message reaches the list twice, I did not see it there,
hence the re-send..Cor)
FB wrote:
> >
> > The question is, what other form can selenium be used that
> > does not contain such high dosage of fixer? Any chemists
> > out there who can provide an answer? What if we buffer the
> > solution, would it make any difference?
> >
>
> Sodium sulphide (Na2S) 40g
> Selenium, red or seleniumdioxide 1g
> water to 1 litre
>
..I believe you have to boil this solution to get the selenium into
solution, at least that is what the T55 formula of Kodak calls for:
(this is a quote from theweb site:
http://digipicture.com/anglais/shop/paper01.htm#, I found this formula
in other sources as well)
TAKE PROPER PRECAUTIONS WHEN BOILING SELENIUM POWDER!!!!!
when you do not have the proper lab equipment and knowledge about
handeling (and disposing!) dangerous chemicals, you'll be probably
better of overprinting your POP and tone with much diluted Kodak
Selenium toner
Selenium toner bath Kodak T55 formula :
hot distilled water:
700 ml
anhydrous sodium sulfite:
150 g
selenium ( pulver) :
6 G
ammonium chloride :
190 G
water to make :
1000 ml
Add selenium and let boil 30 min. Filter to
eliminate
the residues, let cool and add ammonium chloride.
supplement with cold water to make one liter.
For the use, a volume of this solution is diluted
with 5
volumes of water.
The phototype is immersed lO to 15 min (@ 20°C),
then washed carefully according to the conditions
indicated in the preceding lines.
Cor
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