Rabbi Aryeh Lebowitz

If you have metal racks, then it could for sure be kashered.

So what about porcelain?

So almost all poskim hold up porcelain as a din of keres, and therefore it cannot be kashered.

There is a Kula of the Chacham Tzvi that is interesting to note and important to know.

The Chacham Tzvi in Simeon Einhei writes that even though after 24 hours of being in a Kli, the Blios of the Kli lose their Tam L'shvach and they become a Tam Pagum, after 12 months of having a Bliah in the Kli, the Bliah entirely disappears.

it just goes away after 12 months.

So if you have a chamitzpat that had been sitting idle for 12 months, it was shanamu beres, so it sat idle for 12 months, and then it was accidentally used on Pesach, the food inside, well it didn't have to be shanamu beres, it just hadn't been used for 12 months, and then used it on Pesach,

The food in that pot is mutter.

And the reason is because any flavor goes away.

The Yeruch HaShulchan disagrees with this kula.

And he says, no, you can only use this kula if you have another tziruf.

Meaning you have to have some other tzivara lahakel.

So Moshe has a tshuva in Yerudei Chalik Beis, where he says, I'll give you a couple of tzirufim.

You have a family that's choser b'tshuva.

and they have expensive porcelain dishes that have not been used in over a year.

So he says they could use those dishes if they do Hagala Gimel Pa'amin, if they do three times Hagala on it.

Why?

Because Rav Moshe holds that there are three coolness to be mitzvahed.

Number one, you have the Chacham Tzvi, that after a year all the blios disappear.

Number two, you have the opinion of Rabbi Yaakov Emdin that porcelain has the status of glass because it's all glazed, it has a glaze on it, it has the status of glass, and that glass is not absorbed.