Did you perceive a red colour or a blue one?

你看出来是红颜色还是蓝颜色？

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The next day the silcrete had become a deep red colour and was easily flaked.

第二天，砾岩石已经变成了深红色，并且很容易制成片。

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Use 0.1M standard NaOH solution titrant to titrate the solution from red colour to orange.

用0.1M标准NaOH溶液滴定剂，滴定到溶液由红色变为橙色。

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The dark red colour pervades everything, he says: the streets, the sides of the damaged houses and the forbidden zone beyond.

BBC: 'One year' to clean toxic spill in Hungary

This should produce a red colour if the metal contains any nickel.

BBC: Earring

Gap has banned extensive use of the colour red in its in-store ads to avoid causing offence.

ECONOMIST: American retailers