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"complementary colour" is correct and usable in written English.
You can use this term to refer to two colours that are opposite each other on the colour wheel. For example, "Blue and orange are complementary colours."
Dictionary
complementary colour
noun
(colour science) Either of two colours which, when mixed, produce a white or grey
Exact(16)
3. Repaint the scene using your new complementary colour palette.
Mixing a colour with its exact complementary colour can give you an achromatic grey.
Here you will lower the saturation of a colour by mixing it with its complementary colour.
You can either add grey, add white, add black, or dilute a pure colour using its complementary colour.
But her dress was pink and added the complementary colour of the twilight to the orange sky.
An achromatic colour will seem more intense if it is surrounded by neutralized hues or juxtaposed with its complementary colour.
Similar(44)
Complementary colours are colours which lie opposite each other on the colour wheel.
Complementary colours are a must – I used blue and orange to add vibrancy.
You will now use these complementary colours to create a saturation scale ranging from cobalt blue to orange, with grey in the middle.
Print heads with complementary colours of magenta, cyan and yellow were added to black ink, enabling printers to create a full range of colours.
I remember once in an exhibition of the paintings of Patrick Heron in the Tate gallery, realising that afterimages of the colours I was seeing – in complementary colours – were floating all around me in the air of the room.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com