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 Definition: Filter paper which has been treated with a natural water-soluble dye obtained from lichens. The resulting piece of paper, called ' litmus paper ', can be used as a pH indicator.Blue litmus paper turns red under acidic conditions (pH below 4.5) while red litmus paper turns blue under alkaline conditions (pH above 8.3).itmus Paper Definition: Filter paper which has been treated with a natural water-soluble dye obtained from lichens. The resulting piece of paper, called ' litmus paper ', can be used as a pH indicator.