Reference for Sukkah 66:8

לא לעולם דאשחור מעיקרא דחוי מעיקרא דלא הוי דחוי תפשוט מינה אבל נראה ונדחה חוזר ונראה לא תפשוט

No! Indeed it refers to a case where it became black from the outset; and you can deduce from here that something "set aside" from the outset is not permanently "set aside"; But a case in which it was fit and then was "set aside" you cannot deduce from here.

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