Orchilla Lighthouse
Orchilla may refer to: * La Orchila, an island * "Orchella weeds," a lichen that is a source of a purple-blue dye extracted from orcein * Punta Orchilla Lighthouse The Punta Orchilla Lighthouse ( es, Faro de Punta Orchilla) is an active lighthouse on the Canary island of El Hierro in the municipality of El Pinar. The need for a lighthouse on the island was highlighted in the second maritime lighting plan ...

La Orchila
La Orchila Island is an island and a military base off the coast of Venezuela, north of Caracas. It has numerous beaches, including one where the sand is markedly pink (Arena Rosada). There is a presidential retreat on this island, and the residential complex reserved for the military houses consists mainly of elevated houses made of wooden logs. There is also a court for bolas criollas. All the facilities are connected by pathways, mostly unpaved but smooth and clean. History The Spanish explorer Alonzo de Santa Cruz described the island, calling it Orchilla, in the first half of the 16th century: ...to the east of this island ortugafor eight leagues is another joy, Orchilla, eight leagues long and seven wide, with two islands to the south of it; this name was given because there is a lot of Orchilla, of which we speak long in the islands of Canaria General Islario... In 1589 by order of the Spanish governor Diego de Osorio La Orchila and other islands like Los Roques were ...
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Orcein
Orcein, also archil, orchil, lacmus and C.I. Natural Red 28, are names for dyes extracted from several species of lichen, commonly known as "orchella weeds", found in various parts of the world. A major source is the archil lichen, ''Roccella tinctoria''. Orcinol is extracted from such lichens. It is then converted to orcein by ammonia and air. In traditional dye-making methods, urine was used as the ammonia source. If the conversion is carried out in the presence of potassium carbonate, calcium hydroxide, and calcium sulfate (in the form of potash, lime, and gypsum in traditional dye-making methods), the result is litmus, a more complex molecule. The manufacture was described by Cocq in 1812 and in the UK in 1874. Edmund Roberts noted orchilla as a principal export of the Cape Verde islands, superior to the same kind of "moss" found in Italy or the Canary Islands, that in 1832 was yielding an annual revenue of $200,000. Commercial archil is either a powder (called cudbear) or a pa ...
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