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Updated: May 31, 2025
You have already seen that the fine blue ammonia-sulphate of copper transmits a large portion of green, while cutting off all the less refrangible light. A yellow solution of picric acid also allows the green to pass, but quenches all the more refrangible light. What must occur when we send a beam through both liquids?
The following quotations, taken from vernacular papers before the new Press law was enacted, will serve to show what Lord Morley meant when he said, "You may put picric acid in the ink and the pen just as much as in any steel bomb," and again, "It is said that these incendiary articles are 'mere froth. Yes, they are froth, but froth stained with bloodshed."
"And now, sir, I'll go and look after the camels and those half-bred Jew boys what you call Abati, but I call rotten sneaks, for if they get their thieving fingers into those canisters of picric salts, thinking they're jam, as I found them trying to do yesterday, something may happen in Egypt that'll make the Pharaohs turn in their graves and the Ten Plagues look silly."
An application which satisfactorily fulfils these requirements is picric acid. Pads of lint or gauze are lightly wrung out of a solution made up of picric acid, 1½
It was curious to note the discussion which took place a few nights afterwards regarding the failure of the picric bomb. Scientists among us said that the bomb had been made too long; that a chemical reaction had taken place which destroyed its power. A few superstitious ones saw a miracle in what had happened, and they forthwith left our organisation.
"For instance, just a few weeks ago I was reading in the papers about this war in Europe which is a shame and a awful thing; and I hope it won't come here, though if it does you and me are in," says he. "Well, I seen how they make so much powder and sell it smokeless powder. For that they have to use a awful lot of picric acid." "What kind of acid?" says I. "Pickles?" "I don't know," says he.
These characteristics allow us to differentiate atropine and hyoscyamine, the reactions of which are almost identical, as will be seen from the following table, which shows the action of weak solutions of the acids named on the hydrochlorates of the bases: Reagents. Hyoscyamine. Atropine. Picric acid. An oil solidifying Crystalline precipitate. immediately into tabular crystals.
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