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The Surest Purest Method of sealing jellies and preserves is by the use of Parowax

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Pacific Press Publishing Association · Mountain View, California · Sep 16, 1913

FromSigns of the Times, Vol. 40, No. 36.

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The Surest Purest Method of sealing jellies and preserves is by the use of Parowax

(Pure Refined Paraffine)
It's so easy. Just melt and pour over the cooled preserves. Seals absolutely air tight.
Guaranteed under the Pure Food and Drugs Act.
Dealers Everywhere
Standard Oil Company (CALIFORNIA)
SAN FRANCISCO