| The ferricyanide test confirmed that the brown colouration of the water extracts was closely associated with tannins. |
| The ferricyanide-bromide mixture, however, keeps very much better than a plain solution of ferricyanide alone. |
| For some samples a mixture of ferricyanide and ferrocyanide were added to the pellet. |
| The latter spectrum was measured after reduction of cyt-c with ascorbic acid, followed by oxidation using ferricyanide. |
| The ferricyanide had a small influence and, as might be expected, hyposulphite is fatal to the assay. |
| To determine the finishing point, place a series of drops of the ferricyanide solution on a dry white glazed plate. |
