At times, certain areas in a carpet may exhibit some color distortion:
they may appear darker than the carpet from one angle and lighter from
another. This may occur when some pile fibers in the carpet donot lay
along the general direction of the pile, causing the light to be reflected
at a different angle.This shading or 'pile reversal' is commonly observed
in high-traffic area, after use or cleaning.
This is a gradual process, but may become more noticeable just after
cleaning, causing some people to presume that it was caused by cleaning.
This process is usually not treatable, though it can be slowed down by
ensuring that the pile is vacuumed or brushed along the direction of the
pile during regular cleaniong. You may consider carpet rotation to compensate
for shading.