Reference for Shabbat 40:12

ולא בירוקה שעל כו': מאי היא אילימא אוכמתא דחריצי איפרוכי מפרכן אלא אמר רב פפא אוכמתא דארבא

he answered him. An objection is raised: [Garments of] silk, kallak and corded [silk], are liable to fringes.<span class="x" onmousemove="('comment',' V. Num. XV, 38. — This shows that kallak is not identical with silk. ');">²⁰</span> This refutes it.<span class="x" onmousemove="('comment',' Raban's observation. ');">²¹</span>

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