If there are other observable colors, my observation is still valid; it need merely be adjusted to fit the amount of colors. Unless, of course, there are at least 400 other discernible colors, then it is obviously not true.
If there is only 1 other color, I could observe as such: 400 Blue, 200 Grey, 200 Pink and green.
If there are 399 other colors, I could observe: 400 Blue, 1 Pink and green, 1 each of 399 other discernible colors.
Like I said: There is no "definite" here.