Reference for Avodah Zarah 131:3
ורבא אמר בנותן טעם בתר שמא אזלינן והאי שמא לחוד והאי שמא לחוד וה"ל מין בשאינו מינו ומין בשאינו מינו בנ"ט
But Rava said that it must impart a flavor. For we use the criterion of name; and since they each have a different name it is a case of one species [being mixed] with a different species, and in such circumstances the mixture is prohibited only if [the prohibited substance] imparts flavor.
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