There are three cases of colour adjectives that never agree nor change.
1- When the colour is described by a phrase containing two or more words (black and white, dark green, light blue...)Tu as une jupe blanche?
- Oui, et une robe noir et blanc.Do you have a white skirt?
- Yes, and a black and white dress.
- Oui, et une robe noir et blanc.Do you have a white skirt?
- Yes, and a black and white dress.
See also regular colour adjectives: Colour descriptions change according to gender and number (adjectives)
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Examples and resources
Pour le 14 juillet, les gens portent des cocardes bleu blanc rouge.For Bastille Day, people wear blue-white-red rosettes.
C'était une voiture verte.
- Oui, une voiture vert foncé.It was a green car.
- Yes, a dark green car.
- Oui, une voiture vert foncé.It was a green car.
- Yes, a dark green car.