Immersion of Utensils After Long Use Without Immersion
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Question
A person who was not observant of Torah and mitzvot for many years and now, thank God, is returning to faith, does he need to immerse his utensils that he bought from a non-Jew many years ago and did not immerse? Or, since he used them for so long, is immersion not required?
Answer
Utensils that have not been immersed require immersion, and care should be taken to ensure there is no barrier. The blackening caused by fire is not considered a barrier. First, one should purge the forbidden absorptions (if kashrut was not observed) and then immerse.
Source
Chochmat Adam, Sha'ar Issur Ve-Heter, Klal 73, Section 20: "If one used a utensil before immersing it, the food is not forbidden, but even if it was used a hundred times, it still needs to be immersed".
Regarding the blackening, it is from the Rema, Siman 202.
Regarding purging and then immersing, it is from the Shulchan Aruch, Yoreh De'ah, Siman 121.