Crossword Genius

Colour mixed by Dürer (4-3)

Ross

I believe the answer is:

ruby-red

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'colour' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

'mixed by durer' is the wordplay.
'mixed' is an anagram indicator.
'by'+'durer'='bydurer'
'bydurer' is an anagram of 'RUBY-RED'.

Can you help me to learn more?

(Other definitions for ruby-red that I've seen before include "Deep crimson" , "kind of lippy?" , "Gemstone colour" .)

I've seen this clue in The Guardian.
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