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18 The violet dye orchil is obtained from several species of which symbiotic plants?
At 1pm, march up Orchil Road, down Easthill Road and Tullibardine Road and back to the start point.
The dye most sought after was a purple known as orchil (archil or orcein), which was used together with purples extracted from shellfish to color the robes of royalty.
Orchil, which dates back to Roman times, was extracted from lichen that turned blue-purple when soaked in urine, the best specimens gathered from treacherous cliff faces.
Best price is for guided walking holiday in Eskdale in the Lakes where two adults will pay pounds 280 each and one child - four to 15 years and sharing with accompanying adults orchil dren of the same sex - just pounds 30.