The gradual yellowing of foam due to a photochemical reaction It is faster in sunlight than in artificial light, although it occurs in both Fresh foam may discolor in the center of the block as a result of thermal or chemical events (Does not affect physical properties )
change color, often in an undesired manner; "The shirts discolored" cause to lose or change color; "The detergent discolored my shirts" lose color or turn colorless; "The painting discolored
To alter the natural hue or color of; to change to a different color; to stain; to tinge; as, a drop of wine will discolor water; silver is discolored by sea water
dis·col·our discolours discolouring discoloured in AM, use discolor If something discolours or if it is discoloured by something else, its original colour changes, so that it looks unattractive. A tooth which has been hit hard may discolour Some oil had seeped out, discolouring the grass. + discoloured dis·col·oured Some of the prints were badly discoloured. + discoloration dis·col·ora·tion the discoloration of the soil from acid spills. to change colour, or to make something change colour, so that it looks unattractive