If a color derives from a real thing or a you have color + a real thing the color adjective never agrees according to the lesson. Therefore, I am confused as to why an example in a quiz marked the following incorrect:
X une chemise bleu marin
I am given : une chemise bleue marine as the correct response
Marin is sailor or seafarer which is a real thing. This lead me to believe there would be no agreement.
Bleu marine is correct. It is an invariable compound adjective. (It does not derive from the word 'marin' but from marine directly).
https://www.wordreference.com/fren/marine
Per WordReference, marine is not a feminine form of marin. Un marin = a sailor. Marine is the navy itself and is arguably a thing that supplies the color adjective and is therefore invariable. I think the way to handle this is to think of as an invariable compound adjective, go with the flow, and remember that .
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