To remove the dullness, fading and bring out the almost original color of older paper picture prints as well, gently rub on Vaseline Petroleum Jelly ONLY (Do not use creme or lotion or other oil products).....
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Place the whole barometer in a clear plastic zipper lock bag, zip, but keep a slight corner open which to blow air into the bag until taut then seal. Gently push on the surface of the bag see if the barometer...
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