Burnt-on Dirt Residue - Immersion of Utensils

Shalom to the honorable Rabbi,

A used pot that was bought from a non-Jew, and they kashered it by means of light libun (which, as is known, serves as a substitute for hagalah), and afterward they immersed it as it was. My question is whether this immersion is valid, since there remained stuck to the pot residues of dirt that were burned by the fire of the light libun that acted on the walls and handles of the pot. Does such a thing constitute a chatzitzah with regard to the immersion of utensils?

With blessing and thanks

Shalom u’vrachah,

If stuck-on residues remained, the immersion was not effective, and it must be immersed again.

However, if only stains of discoloration remained, which cannot be felt by touch, they do not constitute a chatzitzah, and the immersion is valid.

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