Allen's Commercial Organic Analysis: A Treatise on the Properties, Modes of Assaying, and Proximate Analytical Examination of the Various Organic Chemicals and Products Employed in the Arts, Manufactures, Medicine, Etc., with Concise Methods for the Detection and Estimation of Their Impurities, Adulterations, and Products of Decomposition ...P. Blakiston's son & Company, 1911 |
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Common terms and phrases
acetic acid Acid dye acidified action Alizarin alkali ammonia amyl alcohol aniline aqueous solution Black Blue ppt Bluer boiling Brown pow Brown ppt carbonate Chem chloric acid Chrome cipitate colouring matter Colourless containing Crimson Dark Darker Decolour Decolourised Diamine dilution with water Direct cotton dissolves dyestuff Eosin ether evaporated extract Fast ferric Fibre Solution Fibre filtered filtrate fluorescence forms gallic acid gallotannic acid gives Green heating hydro hydrochloric acid hydrosulphite indigo indigotin insoluble liquid magenta method Methyl mordant Naphthol nitric acid obtained Orange oxidation oxidising Pale Pink potassium precipitate produced Purple reagent Red ppt red solution Redder Reddish Safranine salt sample Scarlet shade silk sodium hydroxide solu Soluble in alco soluble in alcohol soluble in water Solution Fibre Solution stannous chloride strong sulphuric acid substance sulphate sulphide sulphonic sulphuric acid tannic acid tannin thiazine tion Violet ppt washing yellow colour zinc
Popular passages
Page 680 - ... 1 Day . . 2 Days . . 3 Days . . 4 Days . . 5 Days . . 6 Days . . 7 Days . . 8 Days . . 9 Days...
Page 674 - F., protected against the entrance of dust, must remain as free from deposit upon the surface of the ink or on the bottom or sides of the vessel. "2. It must contain no less iron and must have a specific gravity of 1.035 to 1.040 at 60° F.
Page 674 - it must be a gallo-tannate of iron ink, not inferior in any essential quality to one properly prepared after the following formula, in which all the ingredients are of the quality prescribed by the United States Pharmacopoeia, and the...
Page 71 - ... optically clear both by reflected and transmitted light— that is, a bright object, such as an electric light filament, must be distinctly visible through at least 5 cm. thickness and a layer of 1 cm. deep in a beaker placed in a good light on black glass, or black glazed paper must appear dark and free from opalescence when viewed from above. Any necessary mode of filtration may be employed, but if such filtration causes any appreciable loss, when applied to a clear solution, a correction must...
Page 664 - ... of the fats quite colourless, or retaining only the pale yellow colour due to the natural colouring matter of the butter. Excess of ferric chloride must be avoided. Leach (Food Inspection and Analysis, 1909) detects annatto by treating 2-3 grm. of the melted and filtered fat with warm dilute sodium hydroxide. After stirring, the warm mixture is poured upon a wet filter using to advantage a hot funnel. If annatto is present the filter will absorb the colour, so that when the fat is washed off...
Page 77 - C., and makeup to mark after standing not more than 20 hours, nor less than 12 hours. Temperature must not go below 20° C. 7. Total Solids. — Thoroughly mix solution, pipette 100 cc into tared dish, evaporate and dry as directed under
Page 74 - At the end of i hour the powder is freed as far as possible from the residual liquor, and washed and squeezed repeatedly with distilled water until on adding to the filtrate i drop of 10% K2CrO4 and 4 drops N/io AgNO3 a brick-red colour appears.
Page 33 - Commercial Organic Analysis." Volume III, 1900. page 47, catechu (cutch), acacia and areca catechu, extract from wood. Page 49, catechu, or cutch, is the dried extract from the wood of the acacia catechu and allied species. Reference, Procter, " Leather Industries Laboratory Book.
Page 73 - S. 590 paper if a sufficient quantity (250-300 cc) is rejected before measuring the quantity for evaporation ; and the solution may be passed through repeatedly to obtain a clear filtrate. If other methods of filtration are employed, the average correction necessary must be determined in the following manner. About 500 cc of the same or a similar tanning solution is filtered perfectly clear, and after thorough mixing 50 cc is evaporated to determine
Page 72 - ... hours, so as to extract the maximum of tannin. Any remaining solubles in the material must be neglected or reported separately, as " difficultly soluble