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Originally Posted by Master_Shake
For example, when we claim a chair is blue, we are mistaken. It is actually every other colour except blue. Every other visible light wavelength is absorbed by the chair, it only reflects the wavelength we associate with blue.
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You assume, without argument, a rather bizzare usage of words.
You are claiming that the phrase "X is blue" is to be taken to mean "X absorbs lightwaves in the blue part of the spectrum".
If, for some reason, this indeed was what we mean when we say "X is blue", your objection would be justified, but this clearly is not the case.
"X is blue" means "X has the property that makes it seem blue when I look at it under white light", or thanks to our scientific understanding of the mechanics underlying it "X reflects lightwaves in the blue part of the spectrum".