Just to add to what Chris said, when a colour is followed by a noun or an adjective the same rule applies, but without the hyphen-
Des blousons bleu marine = Navy blue jackets
Des cheveux châtain clair = Light brown hair
Hope this helps!
if you use a color composed of two adjectives (such as in the example you give, or, e.g., bleu-clair, brun-foncé, etc.) neither of them changes. So you get off free!
Des chaussures bleu-vert. -- Blue-green shoes (no arguing about taste, please;).
-- Chris (not a native speaker).
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