here in Germany we have a great new livebearers magazine. It is published by Interessengemeinschaft Guppys-Mollys-Xiphos e.V. (engl: pool of guppy-xipho-molly registered society).
Here you can view the first two issues:
Hans Großmann refers to the base color "light blue" in the 1st issue. I think this article is a must have, cause he is the important contemporary witness of the detection of the third blue type.