Early Work In Photography
A Text-book For Beginners
Forfatter: W. Ethelbert Henry C. E., H. Snowden Ward
År: 1900
Forlag: Dawbarn and Ward, Limited
Sted: London
Udgave: 2
Sider: 103
UDK: IB 77.02/05 Hen
Illustrated with an actual negative and positive, and numerous
explanatory diagrams throughout the text
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Weights and Measures, Other Useful Formuloe. 103
Persulphate Reducer.
Negatives with excessive contrast (i.e., with very dense
5
without loss of shadow detail. After treatment, the negativ
must be copiously and rapidly washed in running water.
Blue Tones on Bromide Paper.
Bromide prints (after fixing and washing) can be rapidly
changed to a rich bright blue by immersion in the following
bath:
Ammonio-citrate of iron (ten per cent.)
Potassium ferricyanide (ten per cent.) ..
Nitric acid (ten per cent.) ••
5 parts.
5 »
10 „
100 „
Water.. ••.. .1
When the desired tone is reached, the print lantern
well washed. This treatment is also suitable tor
slides.