Reference for Chullin 49:18

ומה כלי חרס שמיטמא מאוירו אינו מיטמא מגבו כל הכלים שאין מיטמאין מאוירן אינו דין שאין מיטמאין מגבן

[is the distinction made, namely,] if it has no covering close-bound upon it it is unclean, and if it has a covering close-bound upon it it is clean; whereas all other vessels, whether they have or have not a covering close-bound upon them, are unclean.<span class="x" onmousemove="('comment',' It follows therefore that all other vessels can be rendered unclean from the outside, seeing that the fact that these vessels have a covering close-bound upon them is no protection.');">¹⁵</span>

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