For a study I need to solve silk cocoons...

after degumming them in boiling NaHCo3 for 1 hour, we used the trinary solvent (CaCl2, H2O,C2H5OH ) during 4 hours and heated to 60 c ...silk cocoons didn't solve completly....how much does it take to dissolve them compeletly!the changes after 4 hours are so negligible....!what should I do?Have we ignored sth?

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