Word: monomolecular
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Dates: during 1940-1949
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Hair Oil & Aluminum. The polished surface of the mirror was transparent glass, still to be covered with a reflecting film of aluminum. Before this could be done, the glass had to be cleaned perfectly. The trick was to cover the surface with a "monomolecular layer" (one molecule thick) of a fatty acid to keep dust off the glass. This process sounds formidably scientific, but in practice the glass was covered with a well-advertised brand of hair oil (essentially an emulsion of lanolin), and the excess wiped off carefully with special wool flannel...
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