Pretty much just a really light amel. At least that is what I understand the name as. There is not anything genetically unique to the "pastels" that I am aware of. I guess some people could consider them ugly, I like them just because they offer the customer the same diversity in color intensity that the normally pigmented Whitewater specimens do.
-----
James Wilson
Pacific Coast Herpetological
www.pacificcoastherpetological.com