Whitening process parameters			Color parameters			Calculated whitening indices
pH value (C_PH)	$C_{H_{2} O_{2}}$ , %	Walnut meal concentration, (C_M, %)	L	a	b	WI	SI	∆E	x	BI
Unbleached walnut meal		2.5	42.97	8.70	24.70	37.30	26.10	-	0.47	96.68
3	3%	2.5	51.98	8.51	30.75	44.30	31.90	0.20	0.48	97.20
3	3%	5	49.27	8.75	28.23	41.30	29.50	7.50	0.47	94.42
3	3%	10	43.73	6.50	25.40	37.90	26.20	2.10	0.47	93.81
3	6%	2.5	60.55	8.13	29.45	50.10	30.50	18.20	0.44	74.56
3	6%	5	55.99	7.21	27.02	47.80	27.90	1.50	0.43	73.46
3	6%	10	45.63	5.32	20.90	41.50	21.50	5.00	0.43	68.22
3	10%	2.5	72.89	2.90	19.50	66.40	19.70	6.20	0.37	33.43
3	10%	5	66.00	−2.00	23.20	58.80	23.20	10.80	0.38	39.68
3	10%	10	50.10	5.10	26.10	43.40	26.50	3.60	0.44	78.39
7	3%	2.5	52.33	8.75	31.00	42.10	32.20	11.20	0.48	97.64
7	3%	5	50.01	9.12	29.15	41.40	30.50	8.30	0.47	96.81
7	3%	10	48.25	9.50	28.55	40.10	30.00	6.50	0.48	99.75
7	6%	2.5	61.13	8.88	29.70	50.20	30.00	18.80	0.44	75.31
7	6%	5	56.33	7.32	27.25	47.90	28.20	1.90	0.44	73.76
7	6%	10	46.63	7.12	21.90	41.80	23.00	3.20	0.43	73.00
7	10%	2.5	73.12	3.10	19.88	66.40	20.10	7.30	0.37	34.21
7	10%	5	66.52	1.20	20.20	60.80	20.20	8.70	0.37	36.67
7	10%	10	50.75	5.10	26.10	44.00	26.50	3.60	0.44	77.04
10	3%	2.5	56.33	8.80	31.55	45.40	32.70	14.90	0.46	90.19
10	3%	5	52.01	9.33	29.19	43.00	30.60	10.10	0.47	92.19
10	3%	10	49.11	10.50	29.00	40.50	30.80	6.70	0.48	100.77
10	6%	2.5	63.76	9.34	30.43	51.70	31.80	21.50	0.44	73.87
10	6%	5	57.89	8.12	27.39	49.10	28.50	15.10	0.43	72.66
10	6%	10	47.55	7.02	22.11	42.60	23.10	3.00	0.43	71.80
10	10%	2.5	82.12	3.89	22.18	71.20	22.50	5.40	0.37	34.35
10	10%	5	67.77	2.20	20.89	61.50	21.00	7.50	0.38	38.43
10	10%	10	60.15	6.10	30.10	49.60	30.70	2.60	0.44	74.55