A Manual of Photographic Chemistry, Including the Practice of the Collodion ProcessHardwich, T. Frederick
Science
A Manual of Photographic Chemistry, Including the Practice of the Collodion Process
Hardwich, T. Frederick
Photographic chemistry; Photography
More recently, Honey has been employed by Mr. Shadbolt.[52] This
substance can scarcely be termed deliquescent, but it possesses, like
other uncrystallizable sugars, the property of remaining moist and sticky
for a long time. Honey is, according to the Author's views, superior
to inorganic deliquescent salts as a preservative agent, from its
possessing an affinity for Oxides of Silver, and thus acting chemically in
communicating organic intensity to the image.--Collodion plates when kept
long in a moist and sensitive state often give a pale and blue image, even
although the Nitrate of Silver be left upon the film; and neither Nitrate
of Magnesia nor Glycerine appears capable of supplying the deficient
element, both being nearly or quite indifferent to the Salts of Silver.
[52] A claim has lately been advanced by Mr. Maxwell Lyte to be considered
as the discoverer of the Honey Process. This gentleman appears to have
worked simultaneously with Mr. Shadbolt, and to have anticipated him in
publishing; but the object of Mr. Lyte's process was rather to increase
the sensibility of the plates than to confer upon them keeping qualities.
THE HONEY AND OXYMEL KEEPING PROCESSES.
When the weather is cool, Collodion plates may be preserved with tolerable
certainty for a few hours, by simply applying Honey to them in the state
in which they are taken from the Nitrate of Silver Bath.
The best pure Virgin Honey should be obtained by dripping it immediately
from the comb. This point is of importance, since if the sample of honey
be of inferior quality, or adulterated, the process may not succeed. The
quantity of water to be added will vary with the consistence of the honey,
from about an equal bulk to two parts: it should be sufficient to make the
preservative solution pass slowly through filtering-paper.
After the plate is removed from the Nitrate Bath, it is to be drained and
wiped on the back in the usual way. The Honey is then poured along the
edge in such a manner as to form a broad wave which forces the Nitrate of
Silver solution before it and covers the film. Next drain the plate into a
measure and pour on a second portion of Honey as before. This second dose
may be used again for the first application to the succeeding plate.
Lastly, stand the glass on blotting-paper in a dark place for about a
quarter of an hour or twenty minutes, and wipe the lower edge before
putting it into the plate box.
The exposure required will probably be about four or five times as long
as that for new and sensitive Collodion, or twice as long as the exposure
required for old and brown Collodion.
Before applying the developer, immerse the plate in a Bath of rain-water
for five minutes, moving it about occasionally to soften the honey. This
will probably be sufficient for plates which have not been kept longer
than four hours, and beyond that time the process is not considered
certain, since the Honey exercises a slow reducing action upon the Nitrate
of Silver.
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