I’m not going to say I’m very adept at this but the top image is the original scan. By using adjustment layers, I tried to bring out some of the pencil and red. I was trying to retain some of the original coloring which is why I didn’t go for black and white, which might have been a little clearer. I may still do that where there is no red on the page. I’ve never done this kind of thing before so I am afraid my results are rather crude.
You can delete the images once you looked at them (or you can tell me how I can. They have no archival use.