Word: reagent
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Dates: during 1940-1949
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...sale in drugstores for 35? to 40?, the kit consists of a test tube, a dropper and two reagent tablets. To five drops of urine and ten drops of water, add one tablet. If the solution turns blue, there is no sugar in the urine. If it turns any other color (most likely orange), there is sugar in the urine and a suspicion of diabetes. After that, the next step is to see a doctor...
...double-barreled test tube he invented. Then he gets rid of other hormones (progesterone derivatives), which might interfere with the test, by mixing in chloroform and sodium hydroxide. The fluid containing estrone rises to the top. This fluid is put in two other test tubes and a different chemical reagent added to each, for a double check. If the patient is pregnant, one reagent turns the solution dark brown; the other makes it reddish purple.* With both reagents, it becomes amber if she is not pregnant...