From: Sandy King (sanking@clemson.edu)
Date: 02/05/03-08:44:55 AM Z
Scott,
The black granular residue you see in the bottom of the tray after
development is soluble iron that was cleared from the print during
development. You will want to filter this before using the developer
again as an accumulation of iron in the developer will make clearing
the print more difficult. Sodium acetate is a developer that clears
the print very well when you first use it but I have the impression
that it does not hold up as well for re-use as sodium and ammonium
citrate. I may be wrong about this since I really have a lot more
experience with the citrates but the few times I have used sodium
acetate it appeared to me that it did not have as much staying power.
No idea about the "fluffy carbon balls."
Also, no experience in bleaching and re-developing in sepia. Sounds
interesting though so if you do it let us know the results.
Gold toning alone gives a very beautiful and distinctive
purple/blue/black color. However, it is very important to clear the
print completely before toning in gold, and was it for a few minutes,
as it will combine with any remaining silver salts in the paper and
cause a stain in the areas that were brushed with sensitizer.
Sandy King
>Hi all,
>
>I just finished a session printing kallitypes and had some
>observation/questions.
>
>My first question is has anyone encountered a black granular residue left in
>the bottom of the tray after development of a print? I was using sodium
>acetate for the developer and do not remember seeing such a residue
>previously. I also noticed what looked like "fluffy carbon balls" (the kind
>that buildup on glass when put into a flame) floating in the sink after
>dumping leftover sensitizer at the end of the session. All of the chemistry
>was mixed fresh from a new chem order I received about a week or two ago.
>The ferric oxalate was partially frozen, along with some gum arabic
>(previous post), and I was thinking that might have something to do with it.
>The prints look fine though they took about 20 minutes to expose with a
>negative range of 1.8 and double coat of sensitizer on Stonehenge; all
>printings previous took between 6 and 10 minutes with the same negative.
>
>My next question is has anyone bleached and redeveloped a kallitype in sepia
>(specifically a thiourea formula)? I generally tone with gold/citric acid
>before fixing and I am planning on trying the sepia after the fix. I would
>also like to try gold toning after the sepia; any thoughts?
>
>Scott Wainer
>smwbmp@starpower.net
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