Etching was invented in the 15th century and involves etching a design onto a metal plate using acid. The plate is then inked and paper is pressed against it to transfer the design. It produces detailed prints but is time-consuming and requires chemicals. Linocut involves carving away parts of linoleum or wood to create the design. It is simpler than etching but produces rougher prints. Letterpress uses metal or wood plates with raised letters that are inked and pressed onto paper. It was invented by Gutenberg and advanced printing. Rotogravure is like etching but uses a metal cylinder. It can print in color and is used commercially for packaging. Photocopying involves charging a drum, exposing