Reference for Chullin 198:16

רביעית בסאתים

[It is forbidden if there was] a quarter log [of unclean brine] in two se'ahs<span class="x" onmousemove="('comment',' I.e., a proportion of one in one hundred and ninety-two. (One se'ah is six kabs, and one kab is four logs) . If, however, the proportion of the substances was less than this (e.g., if the forbidden substance was one in two hundred) , the mixture would be permitted, even though the substances are of like kind.');">¹¹</span>

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