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The Pamphlet Collection of Sir Robert Stout: Volume 6

Appendix

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Appendix.

The colouring principle of all the following barks is perfectly soluble in water; cotton, woollen, and silken goods dyed with the aqueous infusion assumed the colours below specified.

The affinity of vegetable tissues for colouring matter being in general not so great as that of animal tissues, the woollen material was in nearly all cases dyed of a more decided and darker colour. The exceptions were—the infusion of the bark from the root of Sarcocephalus cordatus, and the infusion of the bark of Alstonia constricta; with these, cotton, woollen, and silken material assumed a colour of equal intensity.

Ranged according to their percentage of tannin the barks would stand thus:—

The barks of Acacia harpophylla, Petalostigma quadriloculare, and Melodorum Leichkardtii rank first; they afford highly astringent infusions, and evidently contain a notable amount of tannin. Next come the barks of Croton insulare, and Rhamnus Vitiensis; then the barks of Chionanthus picrophloia, Xanthoxylon brachyacanthum Erythroxylon Australe, and Guettardella putaminosa. Lastly, the barks of Sarcocephalus cordatus, Alstonia constricta, and Morinda tinctoria.

The bark of Croton insulare, on being distilled with water, yields an oil of an agreeable spicy odour, not unlike mace.

The bark of Melodorum Leichkardtii likewise yields an oil, on being distilled with water, possessing a pleasant cinnamon odour.

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I.—COTTON FABRIC. II—WOOLLEN FABRIC. III.—SILKEN FABRIC. Name of Bark. From Colour of the Dyed Fabric. The Dyed Fabric wrought through a solution of a fixed alkali: colour changed to The Dyed Fabric wrought through a solution of an acid: the colour was The Dyed Fabric wrought through a solution of bichromate of potash: colour changed to Colour of the Dyed Fabric. The Dyed Fabric wrought through a solution of bichromate of potassa: colour changed to The Dyed Fabric wrought through a solution of proto-sulphate of iron: colour changed to Colour of the Dyed Fabric. The Dyed Fabric wrought through a solution of extract of indigo: colour changed to Bark of Chionanthus picrophloia Queensland Pale brownish yellow Brownish yellow Render'd paler but brighter Pale brown Pale brownish yellow Brownish yellow Greenish yellow— Bark of Acacia harpophylla "Palo reddish brown Light reddish brown" Dark brown Reddish br'wn Dark brown Dark dingy olive green— Bark of Xanthoxylon brachyacanthum "Pale brownish yellow Brownish yellow" Pale brown Brownish vol- low Dark brownish yellow Greenish yellow— Bark of Croton insulare "Pale reddish brown Light reddish brown" Dark reddish brown Pale reddish brown Light brown Pale dingy olive green— Bark of Petalostigma quadriloculare "Pale brownish yellow Brownish yellow" Dark brownish yellow Brownish yellow Light brown Dark dingy olive green— Bark from root of Sarcoceph alus cordatus "Bright canary yellow Yellow" Yellow faintly ting'd brown Bright canary yellow Yellow faintly ting'd brown Dull yellow Golden yellow Pretty sea green Bark of Melodorum Leichhardtii "Pale brownish red Bright light red" Dark rich brownish red Bright brownish red Dark brownish red Dark dingy olive green— Bark of Erythroxy-lon Australe "Pale brownish yellow Brownish yellow" Light brown Pale brownish yellow Light brown Greenish yellow— Bark of Rhamnus vitiensis "Palo reddish brown Reddish br'wn" Light brown Pale reddish brown Dark brown Pale dingy olive green— Bark of Guettar-della putaminosa "Pale brownish yellow Brownish yellow" Brownish yellow Brownish yellow Dark brownish yellow Greenish yellow— Bark of Alstonia constricta "Canary yellow Canary yellow" Yellow faintly ting'd brown Canary yellow Yellow faintly ting'd brown Dull yellow Bright canary yellow Rich grass green Bark from root of Morinda tinctorial N. Caledonia Pale orange yellow Pale orange yellow Changed to dull yellow Pale reddish brown Dull orange yellow Dark dull orange yellow Light brown—

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