| Show dyed fiberglass yarns tarns the application of protein films of a ge gelatine laline type to fiberglass yarns as they are ire torn forn ed has made it possible to dye to yarns with erdl nary dyes and by commonly used methods te protein film which Is applied to the filaments while the yarn is being formed represents but I 1 per celt ceat ol of the total weight of the finished yarn ilan however adds greatly to thi depth of 0 color specialists anticipate large industrial use ot of the dyed yarns in the electrical electric al field where they may be used tor for identification in elec electric trie wires and cables |