c. A hygroscopic chemical is one which will absorb moisture from the air, thereby making that
chemical contain more water.
d. A deliquescent chemical is one which will absorb moisture from the air to such an extent
that it will dissolve in the absorbed water.
Thermometers--The common-type thermometers are Fahrenheit and Centigrade. Freezing point on the
Fahrenheit is 32 degrees; boiling point is 212 degrees. The freezing point on Centigrade is 0 degrees; the
boiling point is 100 degrees.
To change Fahrenheit to Centigrade: Subtract 32 from Fahrenheit temperature; divide by 1.8.
To change Centigrade to Fahrenheit: Multiply Centigrade temperature by 1.8; add 32.
1-8.
THE RECOMMENDED PUBLICATION TO REFERENCE FOR OBTAINING
INFORMATION ABOUT PHOTOGRAPHIC CHEMICALS, SOLUTIONS, AND FORMULAS.
The Photo Lab Index, published by Morgan and Morgan, is available in most photographic
laboratories. It contains a wealth of information and is the primary reference source for information of
a technical nature pertaining to photography.
(54) The Photo Lab Index, published by
Morgan and Morgan, is available in
most photographic laboratories. It
is an accountable publication.
An accountable publication avail-
able in most photo labs is the
___ _ _ _ _ _ _ __________ __________.
Photo Lab Index
(55) The Photo Lab Index contains a
wealth of information and is the
primary reference source for infor-
mation of a technical nature.
Information pertaining to photo-
graphic chemicals, solutions, and
formulas can be obtained from the
___ _ _ _ _ _ _ __________ __________.
24
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