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Some are blue and some are purple to my eyes. That bothered me at the time, my thinking being "why the heck can't they keep production consistent?" But as I look at them on my shelf I have to say the series started blue (my copy of Vol 1 is clearly blue as are the other early ones) but later releases were clearly purple.
This is an older discussion on color and perception. Yesterday I was introduced to this online color acuity test:
http://www.xrite.com/custom_page.aspx?pageid=77&lang=en
My final score after one time through it was 21, with most of my deficiency in the blue-green area.
Harry