for offset lithography does not capture, and digital scanners can filter that out.

Editors used the same cyan pencils to add notes to art before publishing, like editors in the broader publishing industry. Original pencil art for comics was initially treated "as a means to an end rather than as an object of intrinsic value" but has come to be viewed as valuable art. The un-inked pencil drawings provide a more detailed representation of the original illustrators' work and have blue-pencil notes