according to the lesson (Colour descriptions change according to gender and number (French Colour Adjectives)) the correct way to say it is:
J'aime les roses roses. -- I love pink roses.
In general, colors derived from object names such as orange (an orange) or marron (le marron/the chestnut) stay immutable. However, the color rose (pink) does vary, even though it seems to derive from a real object, too.
-- Chris (not a native speaker).
Greetings, -- Chris (not a native speaker).
I believe so.
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