oxalic

• It can be cleared with a solution of oxalic or citric acid A brown sepia is obtained by toning first with potassium permanganate, 1 per cent. —  Photographic Reproduction Processes
• The tenability of this view is suggested by the achievements of the synthetic chemists, who are able artificially to build up substances such as oxalic acid, indigo, salicylic acid, caffeine, and grape-sugar. —  The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
• After this she let her hands and forearms lie in the permanganate of potash solution till they were brown to the elbow, then washed away the stain in the oxalic-acid solution and in sterilised hot water. —  A Man's Woman
• There are only four acids that we could expect to find in cane juice--mucous, saccholactic or saclactic, oxalic, and acetic acids. —  The Commercial Products of the Vegetable Kingdom Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise ; Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, ;c.; of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, ;c;.
• Prussiate of potash when brought into contact with the perchloride of iron immediately turns the latter blue, but it does not affect the protochloride A bath is first prepared consisting of ten parts perchloride of iron, five parts oxalic or some other vegetable acid, and one hundred parts water. —  Scientific American Supplement, No. 514, November 7, 1885

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