Dyeing was carried out IR sample dyeing machine with
the optimized dye extract as per standard parameters
recommended for silk fabric, reported in Clariant
manual, i.e., at 80 °C for 60 min under pH 5, keeping a
material-to-liquor ratio of 1:50. Opticid PSD (1.5 g/L)
was used as a buffering agent in the extracted dye
liquor.
Color yield of dyed fabrics
Dyed samples were analyzed by measuring the reflectance
curve between 350 and 750 nm with the spectrophotometer
with illuminant D65 at 100 observer. The minimum of the
curve (Rmin) was used to determine the ratio of light
absorption (K) and scatter (S) via the Kubelka-Munk