Question

Which of these is not a planographic printing process?

• A. Photolithography
• B. Lithography
• C. Collotype
• D. Xerography

Hint:

Planographic printmaking's core principle is chemistry: oil and water don't mix. Lithography, Photolithography, and Collotype all rely on this. Xerography uses static electricity and toner, a completely different principle.

Answer 1

The Correct Option is D

Step 1: Define planographic printing. This category includes all methods of printing from a flat surface (a plane), without any raised or recessed areas. The image is held on the surface by chemical means.

Step 2: Analyze the options.

Lithography is the quintessential planographic process.
Photolithography and Collotype are photo-mechanical variations of the same planographic principle.
Xerography (photocopying) is an electrostatic printing process. It works by attracting charged toner particles to an image area defined by light on a photoreceptive drum. While it prints a flat image, it is not a planographic process in the traditional printmaking sense, which relies on the oil-and-water principle. It's a distinct category of digital/electrostatic printing.