The changing of color of grains, leaves, or stems due to disease, weather, water stress, insect damage, or lack of nutrients.

Any departure from the appearance of the original color.

presence of unusual colors in the water, commonly clear, green or brown.

The act of discoloring, or the state of being discolored; alteration of hue or appearance.

Changes of hues, often uneven and obviously detrimental to the prevailing tones.

3/4Ê Dislocation

A discolored spot; a stain.

(1) Staining. (2) Changing or darkening in color from the standard or original.

a soiled or discolored appearance; "the wine left a dark stain"

Plants infected with a disease of the vascular tissues (the part of the plant that carries water from the roots to the leaves) will often have brownish streaks in the vascular tissues. Picture: Brown vascular tissue in a woody ornamental plant.

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.)