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.
(See Lens, Orthostigmatic.)
C6H4 (OH) NHCH3HCl - II; IV. Methylorthoamidolphenol. A yellowish-white crystalline substance soluble in water; resembles pyro in action, but more cleanly to use; closely allied to rodinol; may be used, instead of mercury, for intensification.
An English unit of weight.
Having the shape of, or resembling, the longitudinal section of an egg; i. e., eliptical.
(See Developing, Over.)
(See Exposure, Over.)
(See Ammonium Oxalate.)
(See Ferrous Oxalate.)
(See Potassium Oxalate.)
Solutions containing oxalate will, with the addition of barium nitrate, give a white precipitate soluble in hydrochloric acid. The addition of silver nitrate to oxalate solutions will give a white precipitate soluble in nitric acid.
(See Acid, Oxalic.)
Yellowish-green, thick extract; unpleasant odor; disagreeable, bitter taste. The bitter fluid secreted by the liver of the ox.
When clarified by boiling with animal charcoal and filtering it is used for water color paintings, etc. Also used to overcome the resistance of a greasy surface.
A gaseous element; forms 8-9 by weight of water; is present and absolutely necessary in the air we breathe; is a component part of various chemicals; is necessary for the reduction of the photographic silver image, for the more rapidly the developer absorbs oxygen the greater will be the reducing action on the latent silver image, which image is changed to metallic silver.
A simplification or modification of the carbon process permitting the making of carbon prints without the direct action of light. Also the making of carbon enlargements from bromide enlargements, thus doing away with the trouble and expense of making enlarged negatives.
Usually a piece of felt or similar material used to place between the back of the printing-frame and the sensitive paper lying on the negative, to insure uniform contact between the printing paper and the film of the negative. Used in platinum printing to absorb dampness, as well as assist in keeping the paper in perfect contact with the negative.
(See Plates, Panchromatic.)