Your Email:

Your Name:

To:

Subject:

Message:
Irui can only kasher the outer layer of a kli. Hot water poured against a cold kli is an example of חם לתוך צונן (hot onto cold) of which we say (Pesachim 76a) תתאה גבר ואדמיקר ליה בלע. The bottom surface succeeds in cooling down the water but not before the water succeeds in kashering the topmost layer. http://www.oukosher.org/index.php/common/article/lo_basi_ella_lorer5/