AMATEUR PHOTOGRAPHY. 



75 



orange G, aniline colors. The first will 

 absorb the green and the latter the blue 

 and violet rays. The gelatine films should 

 be protected with a good coat of varnish. 

 Old negatives may be utilized by removing 

 the image with a reducer and then stain- 

 ing the film with a solution of the dye. 

 One might also place 2 of the differently 

 dyed plates face to face before inserting in 

 the sash, thus avoiding the necessity of 

 varnishing them. 



A weak solution of cyanide of potas- 

 sium will remove the red spots that are so 

 often a blemish to otherwise fine prints on 

 aristo platino. One should bear in mind 

 that it is a deadly poison and must be 

 used with care. A 10 per cent solution 

 makes a good stock strength. This may be 

 diluted 6 or 8 times and used either locally 

 by applying with a tuft of cotton or the 

 print may be immersed in the solution. A 

 few drops, say 2 to the ounce, will prevent 

 dirty whites on developing paper if added 

 to the developer with the regular allow- 

 ance of bromide. Too much will yellow 

 the whites and cause a loss of detail, but 

 it will keep the whites clear where further 

 addition of bromide would result in muddy 

 tones. 



The neatest finish for the sink and 

 shelves of a dark room, as well as the 

 walls in their vicinity, is a coat of bath-tub 

 enamel. For resisting th: action of al- 

 alkalies and acids, a coating of this enamel 

 will surprise anyone who has used only 

 ordinary paint around the developing sink. 

 There will be no water-soaked wood in the 

 room, no blotches of crystallized chemicals 

 where solutions have been spilled, no float- 

 ing particles in the air; no dust collected 

 here and there because it is too much 

 trouble to rub it off. The smooth polished 

 surface is a constant invitation to give the 

 dusting brush the little exercise required 

 to keep all as clean as a parlor. 



A mountant that keeps well in a fairly 

 tight jar is made as follows : Work up 

 2y 2 ounces of best arrowroot with 2 ounces 

 of water to form a thick cream free from 

 lumps. Add 30 ounces of water and into 

 this stir 1-3 ounce of 'good ground glue. 

 Bring to a boil slowly, stirring constantly, 

 and remove after 5 minutes' boiling. When 

 nearly cool, add slowly with vigorous stir- 

 ring 2 ounces of alcohol containing 10 or 

 12 drops of pure carbolic acid. A little 

 perfume may be introduced if desired. 

 Should it become too thick rub up with a 

 little water.. 



To print a developing paper by daylight, 

 fit a printing frame with a hinged or sliding 

 lid so that no light will reach the negative 

 until ready to make the exposure. To bring 

 the time of exposure within easily con- 

 trolled limits it is advisable to fit the print- 



ing frame with a sheet of ground glass or 

 to paste over the front of it several sheets 

 of tissue paper. The light from a North 

 window is the best to employ, as it is sur- 

 prisingly uniform throughout the larger 

 portion of the day. 



Bulbs of instantaneous shutters and 

 other India rubber apparatus that have be- 

 come hard and fragile with time can be 

 softened by putting them in the following 

 bath 5 minutes to an hour, according to 

 their hardness : Water 2 parts, ammonia 1 

 part. In case there are any cracks in the 

 articles, they can be closed, after the soft- 

 ening, by coating their edges with India 

 rubber solution as sold in the bicycle stores 

 for repairing tires. — Western Camera 

 Notes. 



CAUSE OF RUST SPOTS. 

 What is the cause of rust or stain spots 

 on film negatives? I think they do not ap- 

 pear until after prints have been made. 

 Can they be removed? How? Why will 

 not negatives always dry properly? Is 

 silver printing paper the same as Solio? 

 C,. Steckman, Minerva, Ohio. 



ANSWER. 



Rust spots which appear on film nega- 

 tives are probably hypo stains. They 

 may be caused by getting hypo into the de- 

 veloper in some way; for instance, by hav- 

 ing hypo on the fingers. The use of agate 

 ware trays will also tend to give the film 

 the same appearance. 



There is no method known by which 

 hypo or rust spots can certainly be removed 

 from negatives. The most important thing 

 in amateur photography is cleanliness, and 

 great care should be taken in the use of 

 hypo, or spots will appear in the negatives 

 and in the prints. 



Silver printing paper is the same as Solio. 

 Solio is what is known as a gelatinum- 

 chloride on silver printing paper. Almost 

 all the printing-out papers are silver papers. 



If you will use a small quantity of gly- 

 cerine in your last wash water when wash- 

 ing your film negatives, in a proportion of 

 % ounce to 10 ounces of water, your 

 negatives will dry much flatter and be less 

 likely to curl. — Editor. 



MOONLIGHT VIEWS. 

 What is the right exposure for a view 

 by full moonlight? By electric lamplight? 

 The lens is a rapid rectilinear. What kind 

 of pictures can be classed as genre pic- 

 tures? How can I get some photos copy- 

 righted without paying a lawyer to attend 

 to the matter for me? Which is the more 

 rapid, the rapid rectilinear lens with which 

 the 5x7 Poco and Premo camsras art- 

 fitted, or a Bausch & Lomb rapid universal 

 lens, speed of 8? If a view taken with the 

 first lens requires x / 2 second, open dia- 



