I love fall colors! Orange is especially fun because it means Halloween, pumpkins, and the Cincinnati Bengals. I'll avoid my diatribe about how the Bengals suck this year (though I'm still a fan), and skip straight to the inky commentary.
Diamine Blaze Orange is a very lovely ink! The color is a very nice bright orange. This one doesn't lean too much toward yellow, red, or brown, and stays a true clean orange. The shading is quite noticeable and very pleasant. This ink would probably be too light for some people's tastes, and simply just "too loud" for others. I think it is quite readable, but you certainly couldn't use it for much besides personal correspondence or journaling. You might even be able to get away with using this as a highlighter ink, but I haven't tested that theory. It is not supersaturated, but it is very vivid. I really like this ink!!!