If you took a group of Germans and a number of color samples, it would certainly be hard to get them to agree on all of them, especially what each of them would consider "Lila
" and "Violett". But I think it is the idea, the intention, the "world model" so to speak, that counts: Lila
, Violett and Purpur are three separate colors in the minds of most speakers of Germans.
So, many people problaby could not agree what's what, but I don't think that they see those words as mere synonyms, words that you could delete from the language without loss of power of expression.
The entry for "Violett" in the German
Wikipedia shows some color samples:http://de.wikipedia.org/wiki/Violett