pH values of bleaching medium

Whitening time (min.) and values of walnut meal peroxide index (mmol/g oil)

0 min.

10 min.

20 min.

30 min.

60 min.

pH-10

4.71 ± 0.30

4.79 ± 0.33

4.83 ± 0.33

4.85 ± 0.33

4.91 ± 0.34

pH-7

4.75 ± 0.33

4.78 ± 0.33

4.79 ± 0.33

4.86 ± 0.34

pH-3

4.73 ± 0.33

4.76 ± 0.33

4.77 ± 0.33

4.87 ± 0.34