Sequence viewing > Index - Alternative Photo Emulsions - Resource - ©
Photographic Processes - (Hand
made photographic -emulsions and processes)
There seems to be some confusion about the name
in some manuals where the Van Dyke is miss-named as Kallitype, while
Dick Stevens description of it as a Kallitype process in his book "Making
Kallitypes", separates the two, he sees them as related and refers
to Van Dyke Brown as a similar process as brown print Kallitype.
Some information suggests that: the Van Dyke Brown
and the Kallitype both use a mixture of ferric and silver salts as the
sensitiser, but with the Kallitype there is a choice of three different
developers, each giving a variation in image colour.
During the age of their discovery, these process
were notorious for deterioration, but some of this has since been put
down to chemical by products of the process and inadequate paper support
bases. Modern acid-free papers give much more permanent results.
As with the Van Dyke Brown process, the sensitiser
is mixed under a yellow safe light. Use 50 grms of ferric oxalate, mixed
with 50 ml of distilled water.
3 grams of oxalic acid mixed with 50 ml of distilled
25 grms of Silver Nitrate, dissolved in 50 ml of
Top up to 300ml of water.
The mixing, coating and drying is similar to Van dyke Brown.
Rather than developing in water as for the Van Dyke Brown:
* developing in 24grams of borax, 90 grms of Rochelle
salt, and 1.5 grms of potassium bichromate mixed with 950 ml of distilled
water will produce a blue black tone. Developing time is 5 mins
Fixing: 50 grms of sodium thiosulphate ( fixer) disolved in hot distilled
water and when this has cooled add 12 ml of a 0.88 conentrate of ammonia
to make 1 litre.
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