PHOTOGRAPHY.

Taranaki Daily News, Volume XLVII, Issue 8150, 6 July 1906, Page 4

PHOTOGRAPHY.

At ri time of ycur when a general hunjii..vy i)L'rv.uk.s ovciyiiiiDg, anct the -ii'ri liark-ruosn is not always kept iu-siui; unci thy during winter, it may bo a<i. isaijie to utter a word ot c-autiun mh! s»-. 'gvtst that such things left in the dark-i om which have not already buccuuibt i to the enls» oi damp tJiould be prompi iv removed to a more suitable tcri;iU that are must prono to cliange, and whatever may he the material, the dtttern .ation commences from tho edges and itMuifitota itself a.s a dark margin. Perfect dryness it> a maiu factor in preservation, and wrapping in t>i.\, layers of paper saturated with paraffin wax is one oi the best methods for chloride papore. An old and excellent method of cutiug off thorn; chemical fumes in tho atmosphere that attack photographic paper to u*e a shoet of similar paper ias a wrapping; the old-time photographer who cut up sensitive albumenised p;.per into sizes for work would wrap the pieces in a sheet of sensitive paper, and this protective sheet would hu-t a long time. It has been suggested, howcviv. that now silver is cheaper it might !• • worth while for manufacturers ot aeiui-ive pUni* and paper to prepare a >pcc:.sl protective paper, saturated with a silver preparation calculated to absorb the fumes injurious to tho contents oi the packages. Paper &:itur»l<»d with a -ohition of sodi>im bicarbonate and dried makes an excellent chemical protection in some case*. It often soems that textile fabrics arc not usel by the photographer to print <>n a.s often rus might be. The Plat mo* typo Company will supply .silk, etc., r«*ady sensitised, but a silver printing solution is easily prepared, and it is not difficult to apply. Prepare the following :—Boiling water, 8oz; ammonium chloride. lOOgr; Iceland moss, tiOgr. When nearly cold filter it, and immerse the silk for fifteen minute*. When dry, sensitise the silk by inimer.skm for fifteen minutes in an acid solution of silver nitrate; the most suitable .strength is about 20gr of silver in each ounce of water. Dry in the dark, and stretch tho .s:lk over thin cardboard, in order to iisake it lie quite flat while in the print, ing-fran Print much deeper thin usual, and tone in the following bath: Water, 20oz; sodium acetate, lOlVr; gold chloride, 3gr: common whiting, lOgr. To-t the bath with blue litmus paper. and if it gives a red reaction it will be necessary to add a little more whiting, the quantity of whiting being really immaterial, as it has no effect upon the bath beyond neutralising any acid that would otherwise be present. Fix in the game way as for P.O.P.