Hot answers tagged bitul-batel-null
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 ...
Only top voted, non community-wiki answers of a minimum length are eligible