Mechanistic Parallels Between Different Colors Of Chemicals?

[Waynish]

Are there parallels between substances that reflect various wavelengths and their effect in the body? For example, methylene blue (blue), riboflavin (orange), carotene (orange), activated charcoal (black), and quinones (various). Feel free to list more... On some level the wavelengths they reflect must mean something specific about the way in which they'll react with cells and other chemicals when ingested. Thoughts?

 

[michael94]

copper blood is blue when oxygenated... as is copper sulfate
or copper dissolved in acid is also a blue color...

 

[michael94]

iron is an interesting one...

lots of different colors, from rust to iron metal to the beautiful iron sulfate

Vitriol - Wikipedia

 

[Tenacity]

I recall a thread on the forum that discussed the fact that red light is helpful and blue light harmful, yet when it came to pigments (like methylene blue), the reverse was true. I'm sure it's not so simple. I'll try and find the thread.