Commentary for Menachot 84:12

היינו טעימה פסולה היינו צביעה לשמה אמר רב אשי מה טעם קאמר מה טעם טעימה פסולה משום דבעינן צביעה לשמה

Then we take out a little in an egg-shell and test it on a piece of wool; and we throw away what remains in the egg-shell and burn the wool. One can infer three things from this: [i] that the dye used for testing is unfit;<span class="x" onmousemove="('comment',' For dyeing, and the wool dipped in it must be burnt, since it was not dyed for the purpose of the zizith.');">¹⁹</span> [ii] that the dyeing must be for the specific purpose [of the precept]; and [iii] that the dye used for testing renders the rest unfit.<span class="x" onmousemove="('comment',' If it is poured back into the vessel with the dye.');">²⁰</span>

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