is a piece of card which is used to demonstrate the contrast seen in Mach Bands where two grey rectangular objects are placed adjacent to each other producing a contrast across the card.

MACH CARD: "A Mach card is used during an experiment to display the Mach band effect."
Cite this page: Nugent, Pam M.S., "MACH CARD," in, April 7, 2013, (accessed October 20, 2018).