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The simple answer is black.

However, this is true only if the colour of said object is pure blue;

If it has even the slightest tinge of red in it, you will see a very dark shade of red.

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Q: An object appears blue when seen in white light What colour will appear in Red light?
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Does a pure red paper appear black in pure blue light?

it should do objects absorb all light except light of the colour of the object if there is no light of that colour the object appears black


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