Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . acid to urine. {Hawk.) ammonium hydrate solution. presence of uric acid a distinct reddishpurple color will appear. If water be added to this purple solution and themixture evaporated to dryness the color disappears. This latter point isof importance as xanthin, which may resemble unusual types of uric acid inmicroscopic appearance, also gives the murexid test, but the color does notdisappear on heating with water. (2). Sodium Acid Urate (C5H3NaN^03). This salt of uric acid for
Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . acid to urine. {Hawk.) ammonium hydrate solution. presence of uric acid a distinct reddishpurple color will appear. If water be added to this purple solution and themixture evaporated to dryness the color disappears. This latter point isof importance as xanthin, which may resemble unusual types of uric acid inmicroscopic appearance, also gives the murexid test, but the color does notdisappear on heating with water. (2). Sodium Acid Urate (C5H3NaN^03). This salt of uric acid forms the bulk of the brick-dust deposit or sedi-mentum lateritium found when urine has cooled. In such cases the urinefirst shows a milky appearance and the sediment soon settles on the sidesand bottom of the container. This deposit is usually in the form of irregularamorphous granules of a brownish or pink color. Occasionally the sediment 326 DIAGNOSTIC METHODS. may be distinctly crystalline, occurring as prismatic needle-like crystals whichare grouped in star-shaped, fan-shaped or dumb-bell-like Fig. 92.—Acid sodium urate. {Hawk.) (3). Potassiiun Acid Urate (C5H3KN4O3). This substance occurs only as a granular amorphous deposit. Owingto its greater solubility, it does not form as large an amount of the brick-dustdeposit as does the sodium salt. These two latter sediments are occasionally associated with amorphousdeposits of the calcium and magnesium acid urates. These are, however.
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