[pure-silver] Re: toning the new Adox MCC 110
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 24 Jul 2010 11:23:43 -0700
----- Original Message -----
From: "titrisol" <titrisol@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, July 24, 2010 8:22 AM
Subject: [pure-silver] Re: toning the new Adox MCC 110
In the old AGFA MCC110 and 111 the color change was heavily
dependant on the developer
I found that prints developed in Ethol LPD diluted 1+10 or
higher produced very rich purplish blacks; while prints in
more concentrated LPD had a very subtle change of color
Developer certainly has a strong effect on the effect
produced by a toner. In general, toners are affected by the
structure of the silver crystals that make up the image. The
original image color is mostly due to the size of the
crystals, the smaller they are the more the color tends
towards yellow. Extremely finely devided silver, often
called colloidal silver, is bright yellow and is used as the
yellow filter layer in Kodachrome and probably other color
films. Partly, the effect of a toner is due to the ratio of
volume to surface area of the crystal, the ratio becomes
larger as the grain becomes smaller.
Bromide in the developer can affect the image color,
usually the more bromide the finer the crystals and the more
yellow the color. However, Ira Current, of Ansco, found that
very large amounts of bromide added to the developer would
_cool_ the tone given by bleach and redevelop Sepia toner,
its described in his patent USP 2,607,686. Its also true
that the emulsion has a strong effect on the color produced
by a toner, for instance, the polysulfide toners (like Kodak
Brown Toner) now recommended for protection of microfilm
images will produce a sepia color on most printing paper but
results in a blue shift on microfilm which has a very fine
grain structure.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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