Fahr., and when using this so much detail should not be apparent
as when printing for the cold bath process, in which all the detail
desired should be very faintly visible. There are, however, many
methods of exposing the paper and developing it, and no fixed rule can
be made, but the development must in every case be suited to the
exposure or the result will be a failure. For instance, the paper may
be printed until all detail is visible, but a very much cooler
development must be used, say 80 deg. or 90 deg.; on the other hand, a
slightly short exposure may be given, and a temperature of 180 deg. to
200 deg. used. 150 deg. should be taken as the normal temperature, and kept to
until some experience has been gained, as employing all temperatures
will lead to confusion, and nothing will be learned. Some negatives
require a special treatment, and both printing and development must be
altered, while for a very dense negative the paper may be left out in
a dampish room for some time. It will then print with less contrast
and more half tone. A thin negative is better printed by the cold bath
process, but negatives should be good and brilliant for platinotype
printing. Any one taking up platinotype and getting only weak prints
would do well to look to his negatives instead of blaming the paper,
as the high lights should be fairly dense, and the deep shadows nearly
clear glass.
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