Reference for Menachot 78:12

הא כיצד צמר ופשתים פוטרין בין במינן בין שלא במינן שאר מינין במינן פוטרין שלא במינן אין פוטרין

But then consider the next clause [of that Baraitha]: Woollen threads and linen threads fulfil the precept in every case.<span class="x" onmousemove="('comment',' Meaning apparently that if the blue threads are of wool and the white threads of linen they together fulfil the obligation of zizith in any silk garment.');">¹³</span> Now if you say that it is so<span class="x" onmousemove="('comment',' That silk garments must be provided with zizith.');">¹⁴</span>

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