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Mix the ingredients
"Take
a sulphuric ether 12 ounces; add to it half an ounce of iodide of
potassium, previously dried and bruised in a mortar, and allow it to
become saturated by shaking; then add 6 grains of iodide of silver,
shake again to dissolve this, and, after it has become clear, pour it off
into another bottle."
"Next, add about 72 grains of
soluble or gun cotton, or, what is better, add as much soluble cotton as
you consider sufficient to make a solution so thin as to pour freely over
a plate of glass."
"Then in 12 drams of alcohol
dissolve 10 grains of bromide of potassium, and after it is entirely
dissolved, add as much iodide of potassium as will saturate the spirit.
The whole of this is to be added to the above solution of gun-cotton in
sulphuric acid and well shaken."
"As I have found a minute
quantity of free iodide to be useful in collodion, 2 grains of it
may be added to the above quantity."
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