I don't really understand how you can not know the colour (barring turning this metaphysical) unless you live somewhere without any mirrors and even then you'd have to be a very strange child (yes, mathmos, I know) to not be curious enough to ask.
I know the color of my eyes because people told me but I could not pick my kind of green/brown from a set of pictures if you showed me. I just never look at my eyes in the mirror. It might sound weird to you, but thats just as it is. When it comes to other people: I do not know the color of their eyes unless there is something that reminds me (e.g.: we talked about it. someone told me and I remember. ...). I think th…
Isn't there a webservice that maps colors to names? I vaguely recall an XKCD project.