Can one kosher glass?
• ANSWER: On the subject of glass: Glass has been around for a few thousand years, and thus has been argued about within the confines of Halacha over these hundreds of years. We know that wood, metal, earth ware, pottery, bone ware are porous and thus readily, under proper conditions, will absorb whatever liquid has been placed in it. Glass however has initially been considered neither absorbent nor capable of ‘bleeding’ whatever it has in its walls into what is in it. Rabbinical scholars kept checking on the procedures in their day of making glass and many of them have expressed doubts whether under current methods glass is the equal of the ‘glass’ of old. To many it seemed that current methods bring glass closer to that of pottery. Certainly, the glass that is fire proof (Corning ware or Pyrex for example) should be treated in the same fashion as pottery. That is it absorbs and bleeds. Thus should not be used for both dairy and meat. What’s more, like pottery and china cannot be Kosh
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