The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Fuming
Fusible Metal
from the surface of the film. When the plate is collodionised, it is advisable to add about 10 per cent, of methylated alcohol to developer. Soaking the plates in the following for five minutes is sometimes a preventive, but it prolongs development: -
Chrome alum           ... ......... 2 grs
Dissolved in
Water           ...... ......... 1 oz.
Add
Methylated spirit ... ... ...... 1 oz.
Another plan is the following: - Have by the side of the de-veloping or fixing bath a dish of methylated spirit, and if the slightest sign of frilling or blisters, which are but localised frilling, makes its appearance, immerse the plate immediately in the spirit till the frill disappears; then proceed with develop-ment or fixing. Some plates frill at the edges only; for these an edging of grease or india-rubber solution is the remedy. When plates are found to frill in the fixing, but not in develop-ing, the use of a 5 per cent, formalin bath will generally prevent any further spread of the mischief. (See Formalin.)
Fuming. The process of subjecting sensitive albumenised paper to the vapour of ammonia. It is claimed for this that it renders the prints more brilliant, that the paper prints more rapidly, and that it facilitates the toning. Many elaborate boxes have been designed for this purpose, but the simplest and a really efficient plan is to use an old cardboard plate box, and, having cut the paper to the required size, pin it by the four corners face downwards to the lid, and on the bottom inside sprinkle a few drops - about ten or fifteen - of liquor ammoniae •880; put on the lid, and leave it for ten minutes in hot or fifteen in cold weather. Paper when once fumed should be used within two or three days, or the good effect will be lost. Fumed paper is more liable to discolour than ordinary. The after-operations of washing, toning, and fixing are precisely the same as usual. (See Albumenised Paper.)
Fusible Metal. An alloy sometimes used in making casts from gelatine surfaces for the production of printing blocks or plates. Wood's formula for fusible metal is the best, and melts far below the boiling point of water, or at about 700 C.
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