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.
Litmus paper is an indicator used to test whether a substance is acidic or basic. You simply dip the paper in your substance, and it will change colour depending on whether it is acidic or basic. It will go red in an acid and blue in a base. It is a lot of fun to make and is very easy.