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Fix and Wash
"The development being now completed,
the picture must be thoroughly washed, by pouring a stream of water over
it; and then it must be secured from the further action of light"
[fixed]
"and rendered more fit for transferring if a
negative, by removing the yellow iodide of silver from the blanks and
shadows of the picture."
For this purpose I use:
- Cyanide of potassium (crude cakes), 120 grains
- Water (common), 8 ounces. Dissolve."
"After allowing this solution to remove the
whole of the spare iodide of silver, the picture is again submitted to a
thorough washing, and allowed to dry spontaneously, by a gentle heat."
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Varnish
"As
the collodion is liable to be scratched by the paper or otherwise in
copying, it is better to be coated with varnish to prevent this,
especially if it is to be frequently copied.
The varnish used for this purpose
is comprised of -
- Gum damar 1.5 or 2 drams.
- Mineral naphtha, 4 ounces."
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Intensify (if necessary)
"After
the picture has been fixed, and CAREFULLY washed, from cyanide of
potassium, I pour over it a quantity of the negative developing solution,
diluted with an equal bulk of water."
"Upon this is poured a quantity
of a solution of nitrate of silver, in the proportion of 15 grains to 1
ounce of water, and I continue to keep the plate in motion for a time."
"If the image is made strong
enough by a single applicaton, it is well; but if not, a little more
nitrate solution and developing liquid should be applied till the desired
pitch is obtained."
"After this, the plate must be
well washed, and again submitted for an instant to the cyanide of
potassium, and finally washed thoroughly."
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