Seal that indicates a product complies with Jewish dietary laws (kashrut)
Assurance of the kashrut and freshness of certain products may be guaranteed by the attachment of seals. Meat, poultry, cheese, wine, and especially foods to be used during Passover, have been sold with such seal attached at least since the 18th century and likely earlier. Lead, easily stamped and attached directly or by string to the product, has long been the traditional medium, and has the additional advantage of being a reusable substance. Lead seals became commonly known as “plumbas” a term later applied to seals of other materials as well. Groups of lead seals are occasionally found preserved in kitchens where they were systematically collected by thrifty homemakers.
Kosher seals and symbols explained
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