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 Ma Measures, Other Useful Formulae. 101
The negative should be made distinctly warm, but not
reset
be held downwards on a piece of blotting Dhen set the
the drop that will collect there) until set. Tables the
plate should be evenly heated until hardly bearable to
back of the hand, it may then be set away until co .
To remove varnish from a negative.
is sometimes necessary to remove varnish from a nega-
in the same proportions. Finally, well wasL
water.
Cold Varnish for Negatives.
This varnish may be applied to a cold negative, and will
dry in a few minutes. It is sometimes sold as ehe
varnish.
go grains
Gum dammar .. • • * 1 ounce
Benzole • ■ • • ", . 1
the film will not rÏambeheatäafter the him has st if
made quit hot latter the varnish is set) it will be ready for
printing when cold. Conlerd •
P. The following is preferred by some worke .. 1 part
Amyl acetate . • • ‘ : 1 ,
Petroleum benzine .. ••.. 3 parts
Alcohol .. • • ‘* 3
Ether .• • • . the desired
Add enough Celloidin* (or pyroxiline) to give the
consistency. and dissolves slowly, and requires
The celloidin swells and isso days Filter through
frequent shaking during several days.
cotton before use.
---------------------1Cun-cotton in the form of chips.
• A specially prepared Gun- cotton