Preparation and Characterization of Dyed Corn Straw by Acid Red GR and Active Brilliant X-3B Dyes.

In Figure 4 a, the measured data showed that the change of the brightness index L * of the two dyed straw was basically the same, and both curves showed an increasing trend.

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The curves of dyed straw chromaticity index a * showed a decreasing trend, while the curves of the chromaticity index b * adopted first and then rose, shown in Figure 4 b,c, corresponding to the incremental reflection of whiteness, indicating the discoloration of the surface of straw.

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