A manual of photographic chemistry, theoretical and practical . wise the continued breathing of the pent-up fumes ofether, etc., by the operator would eventually be prejudicial tohealth. It must be provided with a water-tap and sink, or,where these are not available, with a large pouring jug andbasin for the reception of washings, etc. No chemicals should be admitted therein which are notnecessary for the purposes of sensitizing, developing, etc., awet collodion plate. And, as the photographer is necessarilyworking in a feeble light, it is useful to have the various solu-tions placed not only
A manual of photographic chemistry, theoretical and practical . wise the continued breathing of the pent-up fumes ofether, etc., by the operator would eventually be prejudicial tohealth. It must be provided with a water-tap and sink, or,where these are not available, with a large pouring jug andbasin for the reception of washings, etc. No chemicals should be admitted therein which are notnecessary for the purposes of sensitizing, developing, etc., awet collodion plate. And, as the photographer is necessarilyworking in a feeble light, it is useful to have the various solu-tions placed not only in different positions, but also in differ-ent shaped bottles, so that the operator, by the sense of touchalone, can put his hand on the solution required. Above allthings, ammonia must not find a place within a dark roomintended for the wet collodion process, because the fumesfrom it very quickly destroy a nitrate bath, and in the devel-opment are very prejudicial. With these preliminary observations, we are now in a posi-tion to proceed with practical CHAPTEK XI. FORMULAS FOE NEGATIVE SOLUTIONS. 1st. The Plain Collodion. Take of— Ether, sp. gr. .725, 10 fluid ounces. Alcohol, sp. gr. .805, 5 Pyroxyline, 120 grains. As before directed, shake up the pyroxyline in a bottle withthe alcohol, then add the ether, and again shake till all thepyroxyline that will dissolve has passed into solution. 2d. To Bromo-iodize the above Collodion. Take •Iodide of ammonium, .... 40 grains. cadmium, 40 Bromide of cadmium, .... 20 Alcohol, sp. gr. .810 to .815, . 5 fluid ounces. Shake in a clean bottle till dissolved, and add to the aboveproportion of plain collodion; or the bromo-iodizing salts maybe dissolved along with the pyroxyline in the stock in this case the formula will be slightly altered, and standthus: Ether, sp. gr. .725, 10 fluid ounces. • Alcohol, sp. gr. .805 to .815, . 10 Pyroxyline, 120 grains. Iodide of ammonium, .... 40 cadmium, 40 Bromide of 20 Put the
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Keywords: ., bookcentury1800, bookdecade1880, bookidma, booksubjectphotography
