Is there any difference (AmE vs BrE) when describing intermediate colors, that is, pairs of colors to get the color in between?
• Red-blue appearance
• Reddish-blue appearance
• Necrotic cartilage is recognized by its dark blue or reddish-blue appearance.
• On sectioning, hemangiomas show a typical red-blue appearance with a spongy or honeycombing surface.
This question is not specific to red and blue color only. It could also be for any other color mix such as gray-white or grayish-white.