Science papers : chiefly pharmacological and botanical / by Daniel Hanbury ; edited, with memoir, by Joseph Ince.

  • Daniel Hanbury
Date:
1876
Catalogue details

Licence: Public Domain Mark

Credit: Science papers : chiefly pharmacological and botanical / by Daniel Hanbury ; edited, with memoir, by Joseph Ince. Source: Wellcome Collection.

    69/578 page 49
    White Eesin, White Pitch, Yellow Eesin, Yellow Pitch [ TVeisses i867. Harz, weisses Fech, gelbes Harz, gelhes Fech], Resina s. Pix flava s. citrina. It is obtained by melting common resin with the frequent Dr. Berg, addition of water and subsequently straining. Accordiag as the melting has lasted a longer or shorter time, the resin remains paler in colour and constitutes Wliite Besin, or becomes darker and is called Yellow Eesin, and is thereby richer or poorer in oil of turpentine. The first, owing to the water which it con- tains, is almost entirely opaque, white, brittle, and becomes gradually yellow. The second, through the formation of a little colopholic acid by reason of the longer melting, is of a yellow,, dark yellow, or brownish colour, very brittle, here and there clear, and has a conchoidal glassy fracture. An inferior kind, called White Fitch, is obtained from the resin that is first pro- duced in the manufacture of tar, and has a brownish-yellow colour. The true Burgundy Besin or Fitch, Besina s. Fix Bur- gundica, is the similarly prepared resin of Ficea excelsa and Finns Finaster, which is brought into commerce in the form of dull, dirty-yellow brittle masses of a glassy fracture, softening in the hand. Ordinary Burgundy Pitch is White Resin which has been gently melted for a short time without the addition of water, so that it is in fact freed from a part of its water, but has not yet acquired the brown colour of colophony. In France as in England the term Bitrgundy Fitch {Foix de Bourgognc) is by the more accurate writers restricted to the melted and strained resin of the Spruce Fir, of which substance the following description is given in the last edition of the Codex:— Codex. \Translation\—Burgundy Pitch is of a brownish yellow, solid and brittle in the cold, flowing when warm, very ten- acious, having a peculiar odour, and an aromatic taste without bitterness; not completely soluble in alcohol in the cold. There is frequently substituted for it another product called white pitch \j)oix hlanche], prepared with galipot^ or a mixture of yellow resin and Bordeaux turpentine, melted and mixed with water; this artificial pitch has a strong smell of Bordeaux turpentine and a very marked bitter taste. It is entirely soluble in alcohol. ^ {Note hy translator).—Galipot, dry resin collected in France from the trunks of Finns maritima, Lamb. ■ E
    digitised image 1
    digitised image 2
    digitised image 3