In UK atheists considred more moral than theists.

[Huggy Bear]

How would YOU determine it's the color red without having the ability to see it for your self?

Measure its wave length directly by sending it through an transparent substance of known index of refraction?

Use a red pass or red cut filter and measure the change in the intensity of light after it passes through?  

If you even paid a millionth as much attention to your high school physics as you’ve wasted on your bible, you wouldn’t have asked questions that so ambarassingly betrayed such a disgraceful lack of interest in the probing of reality.

You see, the difference between Christian morons who think the wish-thinking primitivism that led to Christianity back in the Iron Age is end all and be all of human wisdom on the one hand, and intelligent people who benefited from the accummulated wisdom of 2000 years of science since the start of your disgraceful cult on the other, is a realization that reality exist outside of the immediate, uneducated desire and perception, and is accessible though careful consideration and experimentation based on repeatable measurement?

https://en.wikipedia.org/wiki/Tetrachromacy

Tetrachromacy is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cells in the eye. Organisms with tetrachromacy are called tetrachromats.

In tetrachromatic organisms, the sensory color space is four-dimensional, meaning that to match the sensory effect of arbitrarily chosen spectra of light within their visible spectrum requires mixtures of at least four primary colors.

Would you be so kind as to explain any fourth primary color?

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How would YOU determine it's the color red without having the ability to see it for your self?

You were creating a hypothetical example where no one could see the colour red, so it's whatever people collectively decide to call that band of frequencies.

In the same way that no one can see infra-red or ultra-violate can still measure that these radio waves exist using equipment.

How can you tell that radio waves and infrared light exist if you cannot see them?

For example, Ultra-violet burns our skin.

I can buy a camera filter for example that blocks out all frequencies except for infra-red and take pictures on a very bright day for example.

You end up with pictures like this (not mine but I have done some which are similar in the past)

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There are plenty of ways of measuring and more importantly reliably using these frequencies without being able to personally experience them.

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The above question is for you too.