Is there any publicly available (rdf) color ontology? Thanks for any pointer.
You could use the resources of dbpedia.
SPARQL:
select distinct ?c where {?c a <http://dbpedia.org/ontology/Colour> }
http://dbpedia.org/resource/Turquoise_(color)
http://dbpedia.org/resource/Orange_(colour)
http://dbpedia.org/resource/Gold_(color)
http://dbpedia.org/resource/Terracotta
http://dbpedia.org/resource/Cobalt_blue
http://dbpedia.org/resource/Orchid_(color)
http://dbpedia.org/resource/Buff_(colour)
http://dbpedia.org/resource/Isabelline_(colour)
http://dbpedia.org/resource/Egyptian_blue
http://dbpedia.org/resource/Phthalocyanine_Green_G
http://dbpedia.org/resource/Phthalocyanine_Blue_BN
http://dbpedia.org/resource/Vermilion
(...)