Reference for Zevachim 196:6

מתני׳ <big><strong>טבול</strong></big> יום ומחוסר כיפורים אינן חולקין בקדשים לאכול לערב

[Why do you ask? ] If he is a slaughterer, you can infer [that the immersion is ineffectual] because of the grease; and if he is a grease merchant, you can infer [that it is ineffectual] because of the blood. The question arises only where he is both; [do we say that] he does not object to one, but objects to two; or perhaps he does not object to two either?

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