"Mme Curie has utilized the coloration of the crystals of radiferous barium as a means of controlling the final process of purification. The crystals of salts of radium and barium deposited from acid solutions are indistinguishable. The crystals of radiferous barium are at first colorless, but in the course of a few hours, become yellow, passing to orange and sometimes to a beautiful rose color. The rapidity of this coloration depends on the amount of barium present. Pure radium crystals do not color, or at any rate not as rapidly as those containing barium. The coloration is a maximum for a definite proportion of radium, and this fact can be utilized as a means of testing the amount of barium present. When the crystals are dissolved in water the coloration disappears."
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Radio-activity
Radio-activity is a book written in 1904 (a 2nd edition was published in 1905) by Ernest Rutherford. This was the year prior to Albert Eistein's paper on the special theory of relativity would be published. The following quotes are from the 1st edition of Radio-activity, unless otherwise noted. Rutherford's theory of radioactivity was initially opposed by Pierre Curie, who believed, due to conservation of energy concerns, that radioactive substances causing the energy to be produced from the env
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