A simple laboratory method for making partially reflecting mirrors of high efficiency is provided by fuming titanium tetrachloride onto glass. The reaction of the tetrachloride with atmospheric water vapor allows a thin coating of titanium dioxide to deposit on hot glass.
Alternate layers of fumed titanium dioxide and evaporated magnesium fluoride afford reflectivities over the visible range of from 30 to over 60 percent, depending on the number of layers.
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