toning paper repairs

["Gary E. Walker" <gwalker@xxxxxxxxxxxxx>]

with a 17 cent. book if I repair a corner of a page with a new piece of laid
paper
what is a good brown toning agent

also how do you glue say a new corner of paper on  can it be made to look
not repaired?

with removing an old library mark or newer ink scribble i have used bleach and
q tip with some success is some other chemical available?

also what is a washed book? like 17 cent. books-for sale are sometimes?

gary walker