The Chemistry of Foods: Tea, coffee, cocoa, sugar, etcCommittee of Council on Education, 1881 - Food |
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Page 32
... EXAMINATION . The admixture of foreign leaves with tea is most readily and satisfactorily detected by the microscope . Although it may not be possible to identify every leaf employed to adulterate tea , yet a person intimately ...
... EXAMINATION . The admixture of foreign leaves with tea is most readily and satisfactorily detected by the microscope . Although it may not be possible to identify every leaf employed to adulterate tea , yet a person intimately ...
Page 33
... examination by tearing a portion away from an incision made in the leaf with a sharp knife . The best method , however , is to place the leaf in water containing a few drops of nitric acid , and gradually raise the temperature to the ...
... examination by tearing a portion away from an incision made in the leaf with a sharp knife . The best method , however , is to place the leaf in water containing a few drops of nitric acid , and gradually raise the temperature to the ...
Page 53
... examination , the difference in the densities of the infusions becomes immediately available for estimating the proportion present . In preparing the infusion , 100 grains of the ground substance are placed in 1,000 grains by measure of ...
... examination , the difference in the densities of the infusions becomes immediately available for estimating the proportion present . In preparing the infusion , 100 grains of the ground substance are placed in 1,000 grains by measure of ...
Page 56
... and would only be performed with the view of confirming the results obtained by some of the other methods of examination to which reference has been made . Darkest English Yorkshire . English . Foreign . Guernsey . 56 COFFEE .
... and would only be performed with the view of confirming the results obtained by some of the other methods of examination to which reference has been made . Darkest English Yorkshire . English . Foreign . Guernsey . 56 COFFEE .
Page 58
... examination . The solution of the separate particles in water , and the high colour they impart to it , are indicative of burnt sugar . When all other forms of adulteration have been disproved , it will be necessary to resort to the ...
... examination . The solution of the separate particles in water , and the high colour they impart to it , are indicative of burnt sugar . When all other forms of adulteration have been disproved , it will be necessary to resort to the ...
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Common terms and phrases
250 cubic centimetres Acorns added adulteration albumin alcohol alkaloid analysis appearance bean benzol berries boiling water caffeic acid Caffeine cane caramel cells cellulose cent centimetres of water chemists chicory cloth cocoa cocoa nibs coffee cold water colouring matter Congou consists constituents contains copper crown 8vo crystals cubic centimetres Demy 8vo dextrin dextro-glucose dilute dissolved distilled dried estimation ether evaporated exhausted leaves Fehling's fermentation filtered filtrate glucose grains grams granules green tea husk India infusion insoluble invert-sugar kernel laticiferous laticiferous tissue leaf magnesia mangold wurzel manufacture mineral matter mixture nitrogen obtained Orange Pekoe oxide Parsnips percentage of ash portion potash powder precipitate prepared present proportion Prussian blue pure cane-sugar raw sugar removed roasted sample of coffee seeds Silica skin soluble in water solution Souchong specific gravity starch sulphuretted hydrogen sulphuric acid tannic acid tannin temperature theine theobromine Trinidad vegetable substances weight wurzel
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