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LENSES AND MIRRORS 139
silver reflecting surfaces remain whole and untarnished and the front (glass) surfaces are always clean and undamaged. (159) Low intensity lamp mirrors should be wiped clean and polished with a clean, soft cloth at least once each day, and not less than twice each day where performances are continuous.
(160) In the morning-, when the mirror is cold, polish it thoroughly with a clean, soft cloth. An excellent cleaning fluid is pure grain alcohol and clean water. mixed half and half. Dampen a cloth with it, wipe the mirror face and polish quickly and thoroughly. Do tiol use denatured alcohol as it contains chemicals that leave a thin film on the glass.
(161) Where the flaming type high intensity is used the mirror surface should be wiped with a bit of cloth wet with the water-alcohol mixture, and polished thoroughly, using only a clean, dry, soft cloth. Afterward wipe its surface with a clean, soft cloth immediately before striking the arc for each run. This also holds true for the a. c. arc.
(162) Once each week and daily in continuous theatres, regardless of whether you have high or low intensity, remove the mirrors and wash them thoroughly with strong soapsuds. Rinse the soap off and polish them with a soft, clean cloth or soft tissue paper. Some projectionists do this every morning, which is a good practice. Do not get the back of the mirror wet.
Tarnished Mirrors
(163) Under the action of heat, the silver reflection surface will tarnish in time. When this occurs the mirror should be returned immediately to the manufacturer, either directly or through your dealer, for resilvering. (164) If the mirror is pitted or scratched, and the marks are not too deep, the mirror can be ground off and made as good as new at less than the cost of a new one. But if the pit marks or scratches are deep, regrinding is too costly and the mirror should be replaced.