For the source text click/tap here: Ketubot 107
To download, click/tap here: PDF
On our daf, the Gemara suggests we follow the ruling of Rav Zevid with regard to kunya – glazed pottery.
He ruled that glazed vessels are permitted, i.e. they are not absorbent and are thus permitted for use, even if non-kosher food was stored in them, if they are white or black, but are forbidden if they are green.
We review the history of glazing and modern techniques used in the window industry.