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(A) Color change and (B) the absorption and scattering coefficient (K/S) value of silk samples after picric acid and carmine staining: (a) Non-degummed raw silk, (b–j) degummed with 0.01, 0.05, 0.1, 0.3, 0.5, 1.0, 3.0, 4.0, and 6.0 g/L papain, respectively, (k) degummed with 0.5 g/L Na2CO3.
