The Chemistry of Foods: Tea, coffee, cocoa, sugar, etcCommittee of Council on Education, 1881 - Food |
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Page 17
... sulphuretted hydrogen . The filtrate from the sulphide of lead is gently evaporated to a small bulk , and left for twenty - four hours , when the theine will be found to crystallize out in an impure state . The crystals are removed from ...
... sulphuretted hydrogen . The filtrate from the sulphide of lead is gently evaporated to a small bulk , and left for twenty - four hours , when the theine will be found to crystallize out in an impure state . The crystals are removed from ...
Page 56
... sulphuretted hydrogen , and again filtered and the lead precipitate washed . The solution is now boiled to expel sulphuretted hydrogen , and tested for glucose with a standard solution of copper , as described on page 106 . There are ...
... sulphuretted hydrogen , and again filtered and the lead precipitate washed . The solution is now boiled to expel sulphuretted hydrogen , and tested for glucose with a standard solution of copper , as described on page 106 . There are ...
Page 108
... sulphuretted hydrogen solution . The slightest trace of mercury is shown by the production of a light brown or yellow stain . It is well to place a drop of the original liquid beside that which has been subjected to the action of ...
... sulphuretted hydrogen solution . The slightest trace of mercury is shown by the production of a light brown or yellow stain . It is well to place a drop of the original liquid beside that which has been subjected to the action of ...
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250 cubic centimetres added adulteration albumin alcohol alkaloid amount analysis appearance bean benzol boiling water caffeic acid Caffeine cane caramel cells cellulose cent centimetres of water chemical chemists chicory cocoa cocoa nibs coffee cold water colouring matter Congou consists constituents contains copper crystals cubic centimetres dextrin dextro-glucose dilute dissolved distilled dried estimation ether evaporated exhausted leaves Fehling's fermentation filtered filtrate flavour glucose grains grams granules green tea husk India infusion insoluble invert-sugar kernel Large crown 8vo laticiferous laticiferous tissue leaf magnesia mangold wurzel mineral matter mixture nitrogen obtained Orange Pekoe oxide Parsnips percentage of ash portion potash powder precipitate prepared present proportion pure cane-sugar raw sugar removed residue roasted rotatory power seeds Silica skin small quantity soluble in water solution Souchong specific gravity starch sulphuretted hydrogen sulphuric acid tannic acid tannin temperature theine theobromine Trinidad weight woody wurzel Young Hyson