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The viscosity changes of different silk fibroin (SF)/CaCl2/formic acid (FA) solutions (a) the content of CaCl2 in CaCl2/FA solvent was 3, 5, and 8 (w/v) %, respectively, when SF concentration was 15 (w/v) %. (b) The concentration of SF was 15, 20, and 25 (w/v) %, respectively, when the content of CaCl2 was 5 (w/v) %.
