The Dictionary Of Photography

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

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Apply to the canvas in the same manner and with the same brush as used for the sensitising solution. When sufficiently dense, rinse, and fix face downwards in
Hyposulphite of soda ... ...... 20 parts.
Water           ............... 100 ..
Enlargements on Opal and Glass. - Enlarged Negatives.
Enlarging on to opal glass or dry plates presents no difficulties after enlarging upon paper has been mastered, greater care only being necessary to avoid mistakes and failures, as the cost of opals or dry plates is considerably more than with bromide paper. Most manufacturers include with each box of opals trial sheets of bromide paper, which may be used for test exposures, as described previously. For enlarging on dry plates the slowest brand possible should be obtained, the so-called lantern plate being the most suitable. All other operations of developing, clearing, and fixing, are precisely the same, with one slight exception. Enlargements on paper are usually seen by reflected light, whereas enlargements on opal may be examined by reflected or transmitted light, and enlargements on dry plates are always viewed by transmitted light. For this reason enlargements on opal and larger transparencies on dry plates must be developed till they look dense enough by transmitted light, and they will probably appear too dense in the shadows by reflected light; therefore their density must be judged by holding them up to the dark-room window or lamp, just as with negatives. When making large transparencies on dry plates by enlarging, we are enabled to use both pyrogallol and quinol, and obtain a warmer tone than when they have to be examined by reflected light. When many enlarged prints all of the same dimensions from one negative are required, it will often be found advantageous to make an enlarged negative and print by contact from this. For this purpose it is obvious that a small positive must first be made by contact printing from the original negative, and then the enlarged negative from this in the usual way. The best method of making the small negative is a matter of dispute, some preferring the carbon process, others the ordinary lantern or I gelatino-bromide or chloride plate. The latter plan will certainly be found the more convenient for amateur workers. The small