<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en">archil</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31437145</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 20:57:52</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">http://AATesaurus.cultura.gencat.cat/aat/getty_en</dcterms:isPartOf><dcterms:isPartOf xml:lang="en">Tesaurus d&apos;Art i Arquitectura</dcterms:isPartOf><dc:format>text/html</dc:format> <dcterms:alternative xml:lang="en">cudbear</dcterms:alternative> <dcterms:alternative xml:lang="en">orchil</dcterms:alternative> <dcterms:alternative xml:lang="en">red indigo</dcterms:alternative> <dc:description xml:lang="en"><![CDATA[ A natural dye that is bright red to rich purple color, obtained from any of several lichens; used as a pigment, textile dye, wood stain, food colorant, and an indicator dye that turns blue in alkaline solutions. It was by the ancient Egyptians; the preparation was rediscovered by the Italians and used to make the brilliant red and purple Florentine cloth. In the18th century a Scottish chemist C. Gordon patented the process, which he called "cudbear." The dark red color in archil is formed when lecanoric acid is converted to orcein by fermentation then oxidation.  ]]></dc:description></metadata>