Table 5. Hunter’s color values of cookies with different amounts of onion peel powder

Measurement1)	Group2)				F-value
	Control	OP2	OP4	OP6
L-value	76.45±1.083)a4)	58.28±1.26b	55.79±0.43bC	52.19±0.64c	415.47***5)
a-value	–0.00±0.26c	6.61±0.11b	8.59±0.21a	9.13±0.15a	1,384.72***
b-value	33.03±0.44a	27.72±0.26b	26.95±1.14b	26.14±0.35b	68.65***

L-value: Black=0, White=100; a-value: Red=0 to 100, Green=0 to 80; b-value: Yellow=0 to 70, Blue=0 to 70.
Control, no onion peel powder added; OP2, 2% onion peel powder added; OP4, 4% onion peel powder added; OP6, 6% onion peel powder added.
Values represent the mean±SD (n=3).
Different superscripts in a same row indicate significantly different by Duncan’s multiple range test (p<0.05).
p<0.001.