The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

Home | About | Photography | Contact

Retinal Impression
bromide, equal in restraining power to 6 grs. of ammonium bromide, or to 7f grs. of potassium bromide.
Citrate of Potash Restrainer.
Potassium citrate............      l oz.
Water ...............     10 ozs.
of solution.
Citrate of Soda Restrainer.
Citric acid...............    72o grs-
Bicarbonate of soda , .........    884 ,,
or Carbonate of soda (crystallised)... ...1,440 ..
Distilled water, to make......... ozs.
These solutions will keep fairly well. The advantage of these last three restrainers is that when a negative shows plenty of detail, but refuses to gain density, the addition of a little of one of these solutions may be made, and the plate left for hours if necessary, till the required density is obtained, without the slightest sign of fog.
Retinal Impression. Psychography, and the physical ren-dering of thought. Mr. Ingles Rogers states that after gazing at an object for a certain period, and then, in the dark room, directing his gaze towards a sensitive plate, and thinking of the object, a more or less distinct image of the object was impressed upon the plate, and development became possible. Further, he believes that an object seen long since and thought of while his gaze was directed towards the plate, became impressed thereon. Mr. A. B. Chatwood has made experiments in the same direc-tion, and has arrived at conclusions partially similar. (See The Amateur Photographer, Feb. 21st, and March 20th, 1896.)
Retouching is the operation of treating a negative by aid of a pencil or by use of a brush and colour, so as to hide the defects of manipulation or soften down the otherwise too obtrusive freckle or wrinkle in a sitter's face. The subject is too compre-hensive to enter upon at any length, as the necessary qualifica-tions for a good retoucher for the face and hands, which are generally those parts which it is desired to retouch, are, first, a general idea Of the anatomical position of the muscles and bones of the hands ; and, secondly, considerable artistic skill in wielding the pencil or brush. But for the operator who may desire to