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9

As always, the answer is: "it's a machlokes!" Open up a Shulchan Aruch to Yoreh Deah 116:2, where it says not to mix meat and fish. The Taz's opinion is that because meat-and-fish is a health concern, we are stricter about it than normal kashrus prohibitions, therefore if you pour one ounce of fish juice into a hundred ounces of beef broth, you may not eat ...


8

It's Shulchan Arukh YD 98:9 קדירה שיש בה נ"ט זיתים היתר ונפלו בה שני זיתים אחד של דם ואחד של חלב כל אחד מצטרף עם הנ"ט של היתר לבטל חבירו וכן כ"ט זיתים של היתר שנפל בהם כזית חלב ובקדרה אחרת היו שלשים של היתר ונפל לתוכם כזית של דם ונתערבו בשוגג מותר (וכל שכן בב' זיתים אחד של גבינה ואחד של בשר דכל אחד מבטל חבירו):‏ A pot that had in it 59 olive['s ...


4

This is discussed by the poskim to Shulchan Aruch YD 99:6. The Ram'a there rules that if some milk got mixed with more than 60 times as much water, and then this water/milk mixture later was mixed with meat, the final mixture would be permitted although there is not 60 times as much meat as milk. This is because the milk already became nullified in the water....


2

Before nightfall at the start of 15 Nisan, Chametz is just like any other prohibited food in terms of nullification in mixtures (ShA OC 447:2, cf. YD 102:4) so regular rules like 1:60 and Ta'am Lifgam would apply. From that point until the end of Pesach it is never nullified in a mixture and forbids one from deriving any benefit from the mixture (OC 447:1). ...


2

Rambam Metammei Mishkav uMoshav 2:6 says that if a Zav's saliva fell into water and it dissolved into the water then everything is Tahor assuming the water hasn't changed color. Looking at further cases there (eg. urine of a Zav mixed with urine of a Tahor person) it seems that in general we go by majority assuming the item in question isn't still detectable ...


1

The answer of Rabbi @Double AA is perfect but I have a great desire to talk about this topic with a couple of mishnayot and Gemarot. see mishna Orla (2, 2-3): הַתְּרוּמָה מַעֲלָה אֶת הָעָרְלָה, וְהָעָרְלָה אֶת הַתְּרוּמָה. כֵּיצַד, סְאָה תְרוּמָה שֶׁנָּפְלָה לְמֵאָה, וְאַחַר כָּךְ נָפְלוּ שְׁלֹשָׁה קַבִּין עָרְלָה, אוֹ שְׁלֹשָׁה קַבִּין כִּלְאֵי ...



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