File:The American annual of photography (1919) (14782428212).jpg

Identifier: americanannualof3334newy (find matches)
Title: The American annual of photography
Year: 1919 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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to admitair. Plates made by the above formula give a range of colourfrom pure black to warm red, dependent on length of expos-ure and character of developer. And here let me interpolatethe remark that it is much better to have a good variety ofcolour in a series of lantern slides than one unvarying colour,however good. It is an axiom in lantern slide work that shortexposures and normal developers give black and warm blackcolours. Lengthening the exposures and restraining the de-veloper give warmer colours, even reds. At one time theaddition of ammonium carbonate to the developer was theroyal road to warm rich colours in lantern slides and years agoI achieved some extremely gratifying results; but alas! thebeautiful warmth conferred by the ammonium carbonate grad-ually vanished from the slide, leaving a dingy warm black in itsplace. The following developers have been used for platesmade as previously stated, but any standard lantern slide de-veloper will give satisfactory results. 178
Text Appearing After Image:
0. C. CONKLING, 179 For black colours amidol is excellent, but is very rapid inaction, and a slide that looks dense enough before fixingmay be but a ghost on leaving the fixing bath. Amidol 20 grains Sodium sulphite 240 grains Potassium bromide 10 grains Water 10 ounces The following pyro-ammonia is very reliable for pleasingwarm brown colours: A. Pyrogallol 30 grains Sodium sulphite 120 grains Citric acid 3 grains Water 10 ounces B. Ammonium bromide 40 grains Liquor ammonia (.880) 30 minims Water 10 ounces Equal parts to develop. Care must be taken when developing for warm colours notto develop too far as unlike the black tones the warm coloursleave the fixing bath much denser than one would judge themto be when developed. If very warm colours are desired re-course must be had to ammonium carbonate, which may con-veniently be kept as a 10 per cent solution and ten or twentyminims added to the ounce of developer. An excellent method of obtaining warm colours is by way ofa good black i

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