The orchilla is a delicate fibrous plant, springing up in situations that are apparently the most unfavourable to the sustenance of vegetable life. When gathered it has a soft delicious odour, which it retains for a great length of time. Mr. Glas, in his history of the Canary Islands, gives so clear and accurate an account of its growth, that I will avail myself of his description, as being not only the best I have met with, but as containing all the necessary particulars. "The orchilla weed," he observes, "grows out of the pores of the stones or rocks, to about the length of three inches: I have seen some eight or ten inches, but that is not common. It is of a round form and of the thickness of common sewing twine. Its colour is grey, inclining to white: here and there on the stalk we find white spots or scabs. Many stalks proceed from one root, at some distance from which they divide into branches. There is no earth or mould to be perceived on the rock or stone where it grows. Those who do not know this weed, or are not accustomed to gather it, would hardly be able to find it, for it is of such a colour, and grows in such a direction, that it appears at first sight to be the shade of the rock on which it grows."
Mr. Glas adds, that the best sort is of the darkest colour, and nearly round; and that the more white spots or scabs it exhibits the better. It is found in considerable quantities in the Canary Islands, the Cape de Verds, the Azores, and the Madeiras, and such are the nice varieties and properties incidental to the different soils, (if they may be so called,) or climates, that although the above clusters of islands are at no great distance from each other, the difference in the produce makes a very considerable difference in the value of the article. It is also found on the coast of Barbary, and the Levant, and on that part of the coast of Africa, which lies adjacent to the Canary-Islands; but, owing to the want of seasonable rains, the produce of the latter is not rapid or abundant, although the quality is excellent. It has been suggested, that the orchilla was probably the Gertulian purple of the ancients; a conjecture which is strengthened by the fact, that the coast of Africa, where the orchilla abounds, was formerly called Gertulia. That the vivid dye which resides in this weed was known to the ancients, does not admit of any doubt.
The plant belongs to the class Cryptogamia, and order Algae, of the Linnean system, and to the class Algae, and order Lichenes, of the natural system. Professor Burnett, in his Outline of Botany, informs us, that "Roccella, a corruption of the Portuguese Rocha, is a name given to several species of lichen, in allusion to the situation in which they are found; delighting to grow on otherwise barren seaward rocks, that thus produce a profitable harvest. Tournefort considers that one species at least (R. tinctoria) was known to the ancients, and that it was the especial lichen (Greek: leichaen) of Dioscorides, which was collected on the rocky islands of the Archipelago, from one of which it received the name of the 'purple of Amorgus.'"
Of all the known varieties of orchilla, that which is grown in the Canary Islands stands the highest in estimation, and brings the greatest price. In the collection of the weed, which is always performed by the natives, the risk is imminent: they are obliged to be suspended by ropes over the cliffs, many of which are of stupendous height, and loss of life frequently occurs in these perilous efforts to contribute to the luxury of man. Such is the esteem in which the orchilla of the Canaries is held, that it has recently reached the enormous value of 400l. per ton. That from the Cape de Verds is next in quality, but of much greater importance, in reference to the quantity produced. Madeira and the Azores produce the next qualities. The same plant, though of a very inferior character, is found in great abundance in Sardinia, in some parts of Italy, and also on the south coast of England, Portland Island, Guernsey, &c. but of so poor a kind that it would not reward the expense of collection.
The original mode of preparing orchilla, that which was practised by the ancients, is said to have been lost, and many chemical experiments exhausted in vain for its recovery. In 1300, however, it was rediscovered by a Florentine merchant, and from that period preserved as a profound secret, by the Florentines and the Dutch. It appears that the Florentines were not satisfied with keeping the preparation of orchilla a mystery from the rest of the world, but that they endeavoured to lead all inquiry into a false channel, by calling it tincture of turnsole, desiring it to be believed, that it was an extract from the heliotropium or turnsole: the Dutch also disguised it in the form of a paste, which they called lacmus or litmus. The process is now, however, generally known, and simply consists of cleaning, drying, and powdering the plant, which, when mixed with half its weight of pearl ash, is moistened with human urine, and then allowed to ferment: the fermentation, we are informed by Professor Burnett, "is kept up for some time by successive additions of urine, until the colour of the materials changes to a purplish-red, and subsequently to a violet or blue. The colour is extremely fugitive, and affords a very delicate chemical test for the presence of an acid. The vapour of sulphuric acid has been thus detected as pervading to some extent the atmosphere of London."
I understand—and for some valuable particulars I here beg to tender my acknowledgments to Mr. John Aylwin, merchant of London—that the great object obtained from this vegetable dye, is the production of a red colour, without the aid of a mineral acid. But the utility of the orchilla is not confined to the purposes of manufacture. It has been successfully employed as a medicine in allaying the cough attendant on phthisis, and in hysterical coughs. It is also variously used in many productions, where its splendid hue can be rendered available, and imparts a beautiful bloom to cloths and silks.
The introduction of the weed into England came originally through the Portuguese. The Cape de Verd Islands having long been a possession of the crown of Portugal, orchilla became a royal monopoly, and was transmitted in considerable quantities to Lisbon, where it was sold by public auction; from Lisbon it gradually found its way to England, France, Germany, &c. The recent political contest in Portugal, caused a total suspension of the shipment of orchilla at the islands. About six months ago, there were two cargoes at Bona Vista waiting for orders, one of them (a vessel of about 66 tons) put to sea, and arrived safe at Lisbon only a few weeks before Admiral Napier's naval victory. When the news of the result of that battle reached the island, the holders of the remaining cargo proposed to hand it over for a consideration to certain parties in the interest of Donna Maria, and it was accordingly consigned to a Portuguese house in London. The vessel in which it was sent was called the Saint Anne, of 60 tons, and sailed under British colours: the cargo consisted of 564 bags,[[8] ] each containing 2 cwt., and the whole sold for 15,000£. I mention this circumstance as an occurrence worth being recorded; the arrival of a vessel to England direct from the islands being a great novelty, accounted for, in this instance, by the political events which threw the trade out of its regular channels.
The principal manufactories of orchilla in England are London and Liverpool, but there are many others in different parts of the country. The chief manufacturers are Messrs. Henry Holmes and Sons of Liverpool, and Mr. Samuel Preston Child of London. The manufactured orchilla is frequently shipped to Germany, Holland, &c. in its fluid state, with a small proportion of weed in each cask for the satisfaction of the purchasers. The inferior qualities of the weed, and also a variety of mosses that have the same properties as the orchilla, only in a minor degree, are dried and ground to a fine powder, which is denominated cudbear, and is applicable to the same purposes as the weed itself.[[9] ]
It is a curious illustration of the importance that is attached to the weed generally, and to the weed of the Canaries in particular, that, within the last twenty years, the latter production was considered in London as a remittance equivalent to specie, and was invariably quoted in the usual channels of commercial intelligence with the price of gold and silver, thus:—
| Doubloons | per ounce |
| Dollars | ditto |
| Orchilla Weed | per ton |