There is one experiment which I always like to try, because it proves something whichever way it goes. A solution of iodine in water is shaken with bone-black, filtered and tested with starch paste. If the colorless solution does not turn the starch blue, the experiment shows how completely charcoal extracts iodine from aqueous solution. If the starch turns blue, the experiment shows that the solution, though apparently colorless, still contains iodine which can be detected by means of a sensitive starch test.
Starch makes the gentleman, etiquette the lady.
It is an impressive place that smells like the 1950s, when everyone wore starch white shirts and black slacks and perfect crewcuts and worked on massive industrial projects.
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