Thanks everyone! ReyDar64, to quote one of my previous posts: Letterpress printing is a printing technique which has been in use in the West since around the 15th Century (Gutenberg used it to manufacture his version of the Bible). It involves locking movable type into the bed of a press, inking it, and rolling or pressing paper against it to form an impression. It's a very time-consuming process, as each invitation needs to be hand fed through the machine. It results in an indentation on the front side of the invitations, and raised print on the back.