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Updated: May 26, 2025
No doubt either of these samples can be used with success in preparing emulsions, but to those who are inexperienced, I recommend that the recrystallized salt be employed. We make, then, a solution of recrystallized silver nitrate in distilled water, containing in every 12 ounces of solution 11/4 ounces of the salt. The next material we require is a soluble bromide.
The solution was purified by repeated boilings, the impurities being gotten rid of by successive careful decantings of the liquid from one vessel into another, so that the sediment might be left behind as the top part was poured off. When sufficiently boiled down the solution was recrystallized in shallow earthenware pans.
Structures dissolved have recrystallized, taking forms dissimilar in aspect to the original forms, but inwardly built upon the same plan. For the dissolutions really effected represented only a separation of masses, not a breaking up of substance into independent units; and these masses, again cohering, continue to act only as masses.
Strike out of existence at this moment every person who was breathing on that day, May 27, 1835, and every institution of society, every art and every science would remain intact and complete in the living that would be left. Every idea the world then held has been since dissolved and recrystallized. We are repeating the same process.
Recrystallized silver nitrate, prepared by redissolving the ordinary salt in distilled water, and again evaporating to the crystallizing point. By this means the impurities and free acid are removed. I have a specimen of this on the table, and it consists, as you observe, of fine crystals which are perfectly colorless and transparent; it is also perfectly neutral to test paper.
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