What is Batel B’Shishim (nullified in 60)?

A mix of two kosher ingredients that can make it kosher or not-kosher depends on if it is “Batel B’Shishim” or nullified in 60 (Hebrew: בטל בשישים), and can apply to:

  • Milk and meat
  • Fish and meat
  • Kosher for Pesach and Chametz (hint: the nullified in 60 is never applied for Passover!)

How is it calculated? 1/60th of the total volume of the food.

I can’t write better than Rabbi Dovid Heber from Star-K kosher:

Chart and many scenarios can be found here

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