Values are expressed as mean ± standard deviation. Values with the same superscript along the same column indicate no significant difference at p < 0.05. BF: Bambara groundnut formaldehyde treated film; BN: Bambara groundnut untreated film; BUV: Bambara groundnut ultraviolet treated film; SN: soybean film (yuba). ∆E: total colour difference; WI: whiteness index; YI: yellowness index.
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