The Dictionary Of Photography

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

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of one corner of the plate with a pair of pliers, and dry evenly from a top corner downwards over a spirit lamp or Bunsen burner. If any stain or deposit is left by unequal drying, the plate must again be rinsed with distilled water, and dried in the same way. The chief point is not to touch the plate with any-thing but the liquids, or a mark will be made which nothing will eradicate. To copy a daguerreotype the best plan will be to place it inside a deep box, lined with velvet or black cloth, with a hole in the lid for the lens to peep through, and a piece cut out of one side only to illuminate the plate by - sunshine is best, though the light from an enlarging lantern is equally as effective. In most daguerreotypes the marks of the buffer are seen as fine horizontal lines. In copying, these should be placed vertically, and when in that position are barely visible.
Dallastint. A secret process of photo-blockmaking for the rendering of half-tone.
Dammar. A tasteless, odourless, whitish resin obtained from the Amboyna pine, whose habitat is the Malay Archipelago. It is used in varnish-making, for which purpose it is usually dissolved in turpentine, or benzole.
Dark-Room. The room in which all operations requiring actual handling of the sensitive plate must be conducted. It is usually lighted by daylight filtered through some non-actinic glass or medium. It was the custom but a year or two back to utilise none but the deep ruby glass for this purpose, but now some equally non-actinic colours giving much more general illumination are used. A good, safe light can be obtained by using what is termed cathedral green glass, with one thickness of canary medium. The author invariably uses artificial light from a paraffin lamp, as by this light, which is constant, a much better idea of the progress of development can be obtained than by such a variable quantity as daylight. Whatever light is used it should always be tested by placing a sensitive plate upon the developing table with some opaque substance, such as a piece of black cardboard, upon it, and left for three or four minutes and then the plate carefully developed should show no image of the card. The general arrangements of the dark-room must be left entirely to the amateur, but the following may be considered