Figure 1. Profile of pre-treatment, dyeing and mordanting.
Figure 2. FT-IR spectrum of onion skin colorant.
Figure 3. Chemical structure of quercetin, the main colorant of onion skin.
Figure 4. Effect of dyeing temperature on the dye up-take of pig leather.
Figure 5. Effect of colorant concentration on the dye uptake of pig leather.
Figure 6. Effect of dyeing time on the dye uptake of pig leather.
Figure 7. Effect of bath ratio on the dye uptake of pigleather.
Figure 8. Effect of sodium caseinate concentration on the dye uptake of pig leather.
Table 1. Characteristics of pig skin
Table 2. Image of pig leather taken with scanning electron microscope(×100)
Table 3. Image of pre-treated pig leather taken with scanning electron microscope(×250)
Table 4. Effect of post-mordanting on the color of pre-treated/dyed pig leather samples
Table 5. Effect of post-mordanting on the colorfastness of pre-treated/dyed pig leather samples
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