âº [ C ] a word or expression that was first used in the US but is now used by people in other countries, especially those where English is spoken:  1 O.K. is an Americanism now used all over the world. 2  He was an immigrant who made it in America; Americanism was his religion.
YUPO is a synthetic paper which is ideal for working with alcohol inks. One of my most favorite surfaces to paint on is YUPO. YUPO is a synthetic paper made from plastic pellets and because of its slick surface, it is ideal for use with alcohol inks. The inks seem to move freely when applied to the YUPO surface.
As the name implies, paper is the primary ingredient in litmus paper. The wood used to make the paper is treated with solvents to get rid of extraneous substances such as lignin and resin; it is then infused with lichen, which is interestingly two organisms--an algae and a fungus--sharing one existence. Two popular varieties of lichen are used in litmus paper, Roccella Tinctoria and Lecanora Tartarea. I is used to determine the pH of a substance (wether acidic or alkaline).