I always find it better to download the image to my computer and print it from graphics software instead of the browser. You would have more control over it. Strange about the yellow/negative image, but as I remember it, (I looked at a few of them last night), there was BLACK around the edge, and the paper colour was a little yellowed.

My scan software would allow me to set the specific area to take the image from so I can avoid that sort of black edging.

In the graphics software, I can also "whiten" the yellowed pages.