Filo silk may now be bought on spools, which keep the silkclean and prevent shopwear and fraying. In this way yousave time and money, by avoiding waste and inconvenience,at the same time improving your workmanship. The colornumber appears on every spool. … Gorticelli Filo Silk is also extensively sold in skeins; eachskein bears a guarantee tag branded Corticelli. Buyersshould look, for this name on spools and on skeins. 87 Corticelli Etching Silk SIZE No. 500. WASHING COLORS. (Called also Outline Embroidery Silk and Lace Embroidery Silk.)