I have a new pan, and I cooked something Pareve in it, but mixed it with a clean Milchig spoon which had been used in the past 24 hours. Could I use the pan for Fleishigs now?

Assuming that the Milchig spoon was used for dairy in the last 24 hours, accordingly, if there were sixty times more in the cooked Pareve pan compared to the amount of the spoon that was stuck into the pan, the pan is considered Pareve, and the food may be used for Fleishig.

If the food was not sixty times more, it must be considered Milchig from now on. The Pareve food which was cooked in it should also be considered Milchig.

 

Sources:

טעמים ומקורות: עיין שו”ע יור”ד ס’ צ”ד ס’ ג-ה. ועיין שם ש”ך ס”ק ט”ו שאם הקדירה חדשה, שיש ליחד הכלי למין הכף לכו”ע.