When are placemats needed when eating, and why are they needed?
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Off the cuff:
Placemats are used to make someone cognizant of something at the table he should not partake of. On a strict halachic basis, it would allow a person to
Additionally, there is a custom to not eat dairy on a meat table and vice versa, even if the table is clean. A placemat would help for this. It is not necessary for a non-kosher table.