Commentary for Menachot 79:8

וליבדקוה אלא גזירה משום טעימה

can it not? - Rather we apprehend that it may have been used for testing.<span class="x" onmousemove="('comment',' This thread of blue may be the testing thread, i.e., the thread that was dipped into the pan of dye in order to ascertain whether the dye had reached its proper strength and consistency, and it may not be inserted in a garment, for it is essential that the dyeing of the thread be prepared specifically for the purpose of zizith and not for testing purposes. According to the second interpretation (v. prec. n.) : the inspection is of no avail, for the dyer may have drawn off a small quantity so as to test its colour and then have poured it back into the pan, which action renders the entire contents of the pan invalid for the zizith.');">¹³</span> But it can be announced on public notices,<span class="x" onmousemove="('comment',' Notifying all dyers that the testing thread may not be used in a garment. And according to the second interpretation: notifying all dyers that the quantity taken for the test may not be poured back into the pan.');">¹⁴</span>

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