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Can I kasher (make kosher) crystal glasses and silver flatware?


Rabbi Barry Dov Lerner

Rabbi Barry Dov Lerner

Question: Can I kasher (make kosher) crystal glasses and silver flatware?

Dear Rabbi,
I have some crystal glasses and silver flatware which were not used in a kosher home. Can they be kashered? I would appreciate a reply.
Thanks, Marilyn

Answer: Dear Marilyn,

First of all, these kinds of questions are always directed to one's own Rabbi who has the final and authoritative ruling.

Secondly, in general I can tell you that flatware that is unjointed, e.g. knives most often, can be dipped in a larger pot of water that is at a rolling boil. Just be careful to stand back and not get burned. Knives, if jointed, can be kashered in this fashion as well without question if they haven't been used for a period of time - most accept the concept of one year while others will accept cleaning and not using for a lesser period of time up to 24 hours, and then also boiled. If the knife can be boiled without harm then it is to be considered kashered.

Glassware can be kashered either by putting into cold water, soaking and changing the water every 24 hours for a total of 72 hours - after thoroughly cleaning the glassware first, of course. Others will accept cleaning the glassware thoroughly first, letting them sit unused for 24 hours and then running them through a kosher/kashered dishwasher.

For Sefardim in general glass is handled far more leniently, and to my own thinking quite properly.

If these items are coming from a home where they haven't been used in quite a while, then it is even easier to proceed with the kashering process.

Best wishes,
Rabbi Dov

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