Talmud for Menachot 84:13

כתנאי טעימה פסולה משום שנאמר (שמות כח, לא) כליל תכלת דברי ר' חנינא בן גמליאל

Are not the rules that the test quantity is itself unfit and that the dyeing must be fo the specific purpose [of the precept] identical in meaning? - R'Ashi answered, One states the reason for the other, as much as to say: Why is the test quantity itself unfit? Because the dyeing must be for the specific purpose [of the precept]. This, however, is a matter of dispute between Tannaim, for it has been taught: The test quantity is itself unfit, for it says, All of blue.<span class="x" onmousemove="('comment',' Ex. XXVIII, 31. The dyeing of the blue thread for the zizith should be the first use of the dye, i.e. nothing should have been dyed with this dye previously. Hence the quantity of dye used in testing is not valid for the zizith.');">²¹</span>

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