OCR Text |
Show Paper for Dark Room. Modern photographic plates are so sensitive that often a screen of red glass in the dark room Is not sufficient to prevent fogging. A French photographic photo-graphic expert gives the following prescription pre-scription for making a paper screen, which is 50 per cent more effective than red glass: Take unsized paper and dip It thoroughly In 100 cubic centimeters of water containing six grains of tartrnzine. Then pass it over blotting paper and dry it. To render the coloripg matter more adherent, ad-herent, a little gum arable may be added add-ed to the solution. |