Photography Product booklet

PHOTOGRAPHY MADE EASY

CHAPTER I
Introductory

Tue PHotocRapHic PROCESS IN QUTLINE—SENSITIVE.
MATERIALS USED—NEGATIVES AND PostTIVES—MAKING
PRINTS BY CONTACT AND BY ENLARGING.

A PHOTOGRAPH is made by exposing, in a camera, a

plate or film to the image of the object which is formed
on the light-sensitive surface of that plate or film by the lens.
This exposure does not make any visible change in that
sensitive surface, but forms an invisible or latent image, which
is made visible by a process called development, The stages
of making a photograph are seven in number : (2) the choice
and arrangement of the subject ; (2) ‘‘ focussing ” the image,
in order that it may be clear and distinct ; (3) the exposure ;
(4) the development ; (5) fixing, by which the sensitive
substance is made no longer alterable by light ; (6) washing,
by which we get rid of the remains of the chemicals used in
development and fixing and other by-products ; and (7)
drying. The result of these processes is what is called ‘a
“negative,” from which a.‘ print ” or “ positive ” is made by
whatis, with certain modifications, a repetition of the processes,
at least as far as stages 3 (sometimes 4), 5, 6, and 7 are
concerned. A print or positive, strictly speaking, is a negative
of the first negative.

We will consider these points in a little more detail. The
chief sensitive substance used in negative-making is a
compound of the metal silver with the liquid element bromine.
‘There are other compounds of silver present in small quanti-
ties, but mainly we depend on silver and bromine, forming a

I

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