Flies will not enter one large English jam factory, although 15,000 tons of jam are stored there in unsealed jars, because the windows are fitted with amber glass, which cuts out the ultra-violet rays.
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Bibliographic details
Press, Volume LXIX, Issue 20989, 18 October 1933, Page 15
Word Count
34Page 15 Advertisements Column 3 Press, Volume LXIX, Issue 20989, 18 October 1933, Page 15
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