Mars with Filters

[mikemarotta]

We all see them differently. As a technical writer for information systems, I pay close attention to accessibility standards. People who have no color misperceptions - or who have otherwise adapted themselves to everyone else's language - are often not cognizant of the range in perceptions. What we call "color blindness" is technically referred to as "daltonism" because it was only in the early 19th century that John Dalton gave the phenomenon a scientific basis. It is not in Aristotle. My wife and I agree on true red versus true green. We choose not to argue aquamarine versus cerulean. Other colors, well, it can be a discussion.

[John Baars]

Thanks for your report!
So , the light-green-filter works for you on Mars? Or would your wife say is it more Turqoise? :smile:

[drock]

Thanks for the write up. Good info there.

[Makuser]

Hi Mike. A great thread here. The same is true with gemstones.
https://www.gia.edu/alexandrite
An Alexandrite gemstone can be seen as red and turn to greenish-blue when going from one light source to another, or pink and turn to a pale blue-green with another. It depends on the light source (solar, tungsten, halogen, or fluorescent) and also the viewer's visual perception. No, I don't have any of the expensive Alexandrite here, but I do have several lab created simulated stones that display this pleochroism. Thanks for the info Mike, and the best of regards.