About potassium permanganate results of 399
11:31
11:22
09:27
10:57
13:57
12:48
07:52
14:40
11:48
13:50
36:58
29:57
49:56
20:29
11:44
14:15
16:38
15:18
14:34
13:27
15:49
14:08
25:19
52:23
15:15
15:49
19:18
29:46
22:44
16:28
18:00
17:08
30:53
15:16
18:38
25:57
22:45
24:19
19:30
57:26
34:53
22:10
20:29
42:28
51:01
54:24