This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
The term haloid salts is applied to four elementary chemicals, which form a group whose chemical properties are more closely connected by their similarity than those of any other group of elements. These four haloid salts, or as they are usually termed halogens, resemble sea-salt in their composition, and are CHLORINE, BROMINE, IODINE AND FLUORINE.
(See Potassium Carbonate.)
Gum Sandarac. Brittle, elongated, light-yellow tears; translucent with vitreous fractures; crumbles to powder when masticated; inflammable. Soluble in alcohol, ether, acetone and in hot caustic alkalies; partly soluble in chloroform, volatile oils, oil of turpentine. Used in making varnishes.
(See Silk, Printing on.)
(See Solution, Saturated.)
(See Paper, Saxe.)
(See Sodium Sulphantimonate.)
Scratches on negative films often occur, and many times they may be retouched by using either a soft pencil or India ink on a brush. In order to avoid the negative being scratched it should be coated with a proper negative varnish. (See Varnish.)
(See Focusing Screen.)
(See Color Filter.)
When chemicals are to be kept in bottles for any period of time, the bottles should be filled full with the solution and the cork or rubber stopper inserted, and then sealed with sealing wax. The sealing wax which may be obtained from any stationery store will answer the purpose. RED SEALING WAX can be made by melting four ounces of bleached shellac with one ounce of Venice turpentine and three ounces of Chinese vermillion. GOLDEN SEALING WAX is made by using powdered yellow mica instead of vermillion. When BLACK WAX is desired ivory black may be substituted in place of the vermillion.
(See Shutter, Sector.)
(See Paper, Self-Toning.)
The process or the act of making a substance sensitive or capable of being easily affected by actinic light.
(See Paper, Sensitized.)
A substance added or applied to the emulsion to increase or alter its sensitiveness to light.