A few months ago I picked up a request to colourise some engravings. They were all by a French artist of the mid 19th century called Gustav Dore. Dore was a prolific artist and created a vast number of engravings to illustrate a number of books. The book in question here was a History of the Crusades by Michaud.
This method of illustration was overtaken by other printing techniques but there are still practitioners. The spitsticker of the title is one of the principle engraving tools used in the construction of these images.