. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. the devel-oper. 7. Using the dustingbrush, care must be taken tohave the broad brush used toclean dust from the surface ofthe plate perfectly dry. in the direction of thedip are caused by lack of acidin the bath. The obvious rem-edy is to add carefully a littlenitric acid. 9. Spots and Pin Holes. Occur from two or morecauses—dust and crystals ofiodo-nitrate of silver. These,occurring upon the face of the negative, prevent the actionof the light upon the film beneath them, and when t
. The silver sunbeam : a practical and theoretical text-book on sun drawing and photographic printing. the devel-oper. 7. Using the dustingbrush, care must be taken tohave the broad brush used toclean dust from the surface ofthe plate perfectly dry. in the direction of thedip are caused by lack of acidin the bath. The obvious rem-edy is to add carefully a littlenitric acid. 9. Spots and Pin Holes. Occur from two or morecauses—dust and crystals ofiodo-nitrate of silver. These,occurring upon the face of the negative, prevent the actionof the light upon the film beneath them, and when the nega-tive is fixed and washed, Fi 3gtransparent spots arefound where they werelocated. If the dust come fromthe bath, it can be fil-tered out. If it comefrom an unclean apart-ment, sprinkle the floorthoroughly with water. To remedy the forma-tion of the iodo-nitrateof silver, all that is nec-essary is to precipitatefrom the solution the excess of iodide of silver, which facili-tates their formation. The usual and best mode of doingthis is to take one-fourth the quantity of your bath of water.
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Keywords: ., bookcentury1800, bookdecade1870, bookidsilversunbeampra00towl1
