You keep editing things substantially after I’ve already replied.
Yes, actually, blue can be measured. Light, like sound, travels in waves, with peaks and distances between those peaks, and the difference between two different colours or two different tones is the difference in the frequencies or wavelengths of those peaks. Frequencies are measurable. Blue objectively exists, just like A440 objectively exists. Did your physicist friend tell you that wasn’t the case? If so, now we’ve gotta throw out standard tuning along with the entire Spring fashion lineup.
What doesn’t objectively exist are synesthetic descriptions like “warm” or “bright”. Sure, they mean something, but what? What combination of fundamental and harmonic frequencies equates to “warm”? We could spectrum analyze a bass tone and say “it’s this, this is warm” but somebody is gonna disagree, and nobody’s doing that anyway. Roger Sadowsky isn’t publishing spectrum analysis graphs of each bass’s tone. He’s just saying “rosewood is warm, and my rosewood is magically extra specially warm.” Of course he is, that’s how we sell things.
Look, you can go ahead with your little passive aggressive jibes implying that I’m stupid all you want. I’m afraid though that it doesn’t make you any smarter. It just makes you unpleasant - but I’ll happily reply to your posts on tonewood all day long.