The Dictionary Of Photography

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

Home | About | Photography | Contact






Brenzcatechin                                              Bromide Paper
in hot water; very little soluble in alcohol, 60 per cent, in glycerine. It is used in toning, and has also been suggested as an addition to developers, and when added in the proportion of 3 parts to every 4 of sulphate of iron is said to give brilliancy to the image. It is a restrainer when used with pyrogallol and pyro-catechine, but an accelerator with eikonogen and hydroquinone.
Brenzcatechin. See Pyrocatechin.
Brilliancy. A term applied to negatives to denote that the lights and shadows are harmonious, each having their due pro-portion of deposit, and there being no fog; the resulting prints are in an equal way perfect in their power of rendering light and shade, distance and effect. This can only be obtained by careful attention to exposure and all the subsequent manipu-lations.
Broken Negatives. When such an unfortunate accident as the breakage of a negative occurs, and the him is uninjured, it may be removed as described under Negatives, Stripping of ; but should the film be broken, lay the negative, film downward, upon a perfectly level surface, carefully place the fractured pieces together, and apply strips of gummed paper along the edges of the negative. When thoroughly dry, turn the negative over, and apply some strips of paper along the margin on the film side; allow it to thoroughly dry, and varnish the film. To print from broken negatives, suspend the frames from an ordinary roasting-jack, or place the frame at the bottom of a box without a lid about 18 ins. deep. Mr. Drinkwater's method of dealing with broken negatives is explained and illustrated in The Amateur Photographer for September 7th, 1900, p. 188.
Bromide Paper. Paper coated with an emulsion of bromide of silver in gelatine, with or without other silver haloids, and intended for obtaining prints by development either by contact printing or enlarging with daylight or artificial light.
Emulsion for Bromide Paper and Opals. Those workers desirous of preparing their own bromide paper and opals will find the following directions useful. Dr. Eder states that " the emulsion for positive prints should work slowly, have little sensitiveness, should be completely free from fog, and give delicate details. This is best obtained by means of an emulsion,
86