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It is well to prepareonly a small quantity of aceto-nitrate at once, as the acetic acid is of asufficiently volatile nature to escape from the solution, which is a notunfrequent cause of the general darkening of the picture. It would be wellto substitute a more fixed acid for the acetic if this be practicable, asit is in the collodion process, where tartaric is recommended. H. C. COWLEY. Devizes, Wilts. _The Double Iodide Solution. _--The great difference in the quantity ofiodide of potassium o...rdered by different persons, to dissolve a givenweight of iodide of silver in a given volume of water, has induced me tomake some experiments on the subject. I find that using pure nitrate ofsilver, and perfectly pure iodide of potassium (part of a parcel for whichMr. Arnold, who manufactures iodine on a large scale in this island, got amedal at the Exhibition of 1851), the quantity of iodide of potassiumrequired varies, _c
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