Discolor
DISCOLOR, verb transitive [Latin]
1. To alter the natural hue or color of; to stain; to tinge. A drop of wine will discolor a glass of water; silver is discolored by sea-water.
2. To change any color, natural or artificial; to alter a color partially. It differs from color and dye, in denoting a partial alteration, rather than an entire change of color.
3. Figuratively, to alter the complexion; to change the appearance; as, to discolor ideas.