Table 3. Surface color of the neat PBAT film and PBAT composite film

Films¹⁾	L	a	b	ΔE
Neat PBAT	94.61±0.19^2)a3)	−0.75±0.02^b	3.64±0.07^b	0.69±0.04^b
PBAT/CuONPs	36.89±0.63^b	7.41±0.32^a	12.64±0.98^a	58.93±0.65^a

Neat PBAT, neat poly(butylene adipate-co-terephthalate) film; PBAT/CuONPs, poly(butylene adipate-co-terephthalate) composite film with 0.08 g copper oxide nanoparticles.
All values are mean±SD (n=3).
Values with different superscript letters (^a,b) in the same column are significantly different at p<0.05 by Duncan’s multiple range test.