Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A brownish-red crystalline organic compound, C20H21N3O, derived from aniline and used in the manufacture of dyes and in Schiff's reagent.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An organic base, C20H19N3, used to make the dye fuchsine
  • n. The deep red or magenta colour of fuchsine (rosaniline hydrochloride).

from the GNU version of the Collaborative International Dictionary of English

  • n. A complex nitrogenous base, C20H21N3O, obtained by oxidizing a mixture of aniline and toluidine, as a colorless crystalline substance which forms red salts. These salts are essential components of many of the socalled aniline dyes, as fuchsine, aniline red, etc. By extension, any one of the series of substances derived from, or related to, rosaniline proper.

from The Century Dictionary and Cyclopedia

  • n. An organic base (C20H21N3O), a derivative of aniline, crystallizing in white needles, capable of uniting with acids to form salts, which are the well-known rosaniline coloring matters of commerce; also, the color thus produced.

Etymologies

ros(e)1 + aniline.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Rose + aniline (so called by Hofmann in 1862) (Wiktionary)

Examples

  • In a series of masterly experiments von Baeyer demonstrated several years ago the chemical nature of the phthaleins and showed that, just like the already known rosaniline dyes, they may be classified as derivatives of the hydrocarbon triphenylmethane.

    Nobel Prize in Chemistry 1905 - Presentation Speech

  • Members of the rosaniline group are all similarly fugitive, while those of the alizarin group possess generally the quality of fastness.

    Scientific American Supplement, No. 810, July 11, 1891

  • Neelson found that the pigment of _B. cyanogenus_ gives a band in the yellow and strong lines at E and F in the solar spectrum -- an absorption spectrum almost identical with that of triphenyl-rosaniline.

    Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"

  • A further proof of the acid nature of lanuginic acid is that wool may be dyed a fine magenta colour in a colourless solution of rosaniline base; for since rosaniline base is colourless, and it only forms a colour when combined with acids, the fibre has evidently acted the part of an acid in the combination.

    The Dyeing of Woollen Fabrics

  • If wool is dyed in a dilute solution of Magenta (hydrochloride of rosaniline), the whole of the base (rosaniline) is taken up, and the whole of the acid (HCl) left in the bath, not, however, in the free state, but probably as NH_ {4} Cl, the ammonia being derived from the wool itself.

    The Dyeing of Woollen Fabrics

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