Commentary for Menachot 85:3

מאי אין לה בדיקה נמי דקאמר אטעימה

it is valid, but if it deteriorated it is invalid; and in order to remember thi think of the phrase 'a false change, a true change!'<span class="x" onmousemove="('comment',' Where the change was for the worse, i.e., the colour deteriorated, it is spurious and is invalid; but where the change was for the better it is genuine and is valid.');">⁴</span> - The statement 'There is no manner of testing the blue thread' refers to the test quantity.<span class="x" onmousemove="('comment',' I.e., there is no manner of testing the blue thread so as to ascertain whether it was dyed in the vessel with the dye or in the quantity taken out as a test.');">⁵</span>

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