 | 1851 - 438 pagina’s
...similar result is obtained by the evaporation of an infusion of black tea. The same action takes place by the exposure of the infusions of many vegetable substances...extractive matter will remain insoluble in water. Again, I had found that the green teas, when wetted and re-dried, with exposure to the air, were nearly... | |
 | 1851 - 450 pagina’s
...similar result is obtained by the evaporation of an infusion of black tea. The same action takes place by the exposure of the infusions of many vegetable substances...extractive matter will remain insoluble in water. Again, I had found that the green teas, when wetted and re-dried, with exposure to the air, were nearly... | |
 | Robert Fortune - 1852 - 456 pagina’s
...same action takes place by the exposure of the infusions of many vegetable substances to the oxidising influence of the atmosphere ; they become darkened...through the solution, and on evaporation the same oxidised extractive matter will remain insoluble in water. Again, I had found that the green teas,... | |
 | 1852 - 252 pagina’s
...same action takes place by the exposure of the infusions of many vegetable substances to the oxidising influence of the atmosphere ; they become darkened...through the solution, and on evaporation the same oxidised extractive matter will remain insoluble in water. Again, I had found that the green teas,... | |
 | 1852 - 536 pagina’s
...same action takes place by the exposure of the infusions of many vegetable substances to the oxidising influence of the atmosphere ; they become darkened...through the solution, and on evaporation the same oxidised extractive matter will remain insoluble in water. Again, I had found that the green teas,... | |
 | 1852 - 1100 pagina’s
...similar result is obtained by the evaporation of an infusion of black tea. The same action takes place by the exposure of the infusions of many vegetable substances...the surface, and this gradually spreads through the soluiion, and on evaporation the same oxidized extractive matter will remain insoluble in water. Again,... | |
 | 1853 - 742 pagina’s
...noticed, that a clear infusion of such leaves, evaporated carefully to dryness, was not all undissolvcd by water, but left a quantity of brown oxidized extractive...re-dried, with exposure to the air, were nearly as dark in color as the ordinary black teas. From these observations, therefore, Mr. Warrington was led to form... | |
 | 1851 - 614 pagina’s
...eame action takes place by the exposure of the infusions of many vegetable substances to the oxidising influence of the atmosphere ; they become darkened...through the solution, and on evaporation the same oxidised extractive matter will remain insoluble in water. Again, I had found that the green tea«,... | |
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... extractive matter will remain insoluble in water. Again, I had found that the green teas, when wetted and re-dried, with exposure to the air, were nearly as dark in colour as the ordinary black teas. From these observations, therefore, I was induced... 