. Biological stains, a handbook on the nature and uses of the dyes employed in the biological laboratory. Stains and staining (Microscopy). leuco-pararosolic acid Rosolic acid, on the other hand, is a mono-methyl derivative, and bears the same relation to rosanilin: CH, NH. HO. OH c / c / \/~\_NH2 CH HO \_/ Rosanilin carbinol leuco-rosolic acid Now the dye to which the name rosolic acid or aurin is generally given in practice is a mixture consisting of both rosolic acid and pararosolic acid together with other closely related compounds. This dye is: AURIN OR ROSOLIC ACID C. I. NO. 724 A mi
. Biological stains, a handbook on the nature and uses of the dyes employed in the biological laboratory. Stains and staining (Microscopy). leuco-pararosolic acid Rosolic acid, on the other hand, is a mono-methyl derivative, and bears the same relation to rosanilin: CH, NH. HO. OH c / c / \/~\_NH2 CH HO \_/ Rosanilin carbinol leuco-rosolic acid Now the dye to which the name rosolic acid or aurin is generally given in practice is a mixture consisting of both rosolic acid and pararosolic acid together with other closely related compounds. This dye is: AURIN OR ROSOLIC ACID C. I. NO. 724 A mixture of rosolic acid and pararosolic acid, with oxidized and methylated derivatives of the latter. This product is of consider- able use as an indicator. Corallin yellow is the name given to its sodium salt. No other dyes of this group have biological use. Two others perhaps deserve mention: CORALLIN RED C. I. NO. 726 Synonym: Aurin R. Apparently a compound dye, the pararosanilin salt of pararosolic acid. CHROM VIOLET A carboxyl derivative of pararosolic acid: COONa 0_/~X— C. I. NO. 727. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Conn, H. J. (Harold Joel), 1886-1975; Ambler, Joseph Alfred, 1889-; Kornhauser, S. I. (Sidney Isaac), 1887-1959; Mallory, Frank Burr, 1862-1941; Sharp, Lester W. (Lester Whyland), b. 1887. Geneva, N. Y. , The Commission
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