Colour tests, be it for fun or of a more serious nature, are all good to help us gauge our individual colour perception/degree of colour blindness
It is important to keep one thing in mind about a colour test like this, be it for fun or otherwise, is that under the low illumination conditions that we find ourselves under, our colour perception and sensitivity can change completely from the bright illumination conditions that these tests are carried under, especially considering that our colour perception stops under low light levels and things appear in shades of grey.
Colour
sensitivity under low light levels also does change with age too, not to mention that colour
perception also depends on gender, age, genetics, and health.
Just eight years ago I could see pinks, greens and blues in M42 including from my home in Sydney. Today, using the same scope, the pinks have disappeared and the greens and blues are not as vivid <sigh...>
The validity of the results of any such test with regards to typical astro conditions are really meaningless unless the same test is also carried out under the exact same low light levels we encounter, and then the test itself needs to be altered again to provide a new standard under these conditions.
