What is Permanent Pile Reversal Shading in carpets?

What is Permanent Pile Reversal Shading in carpets?
Permanent Pile Reversal Shading is a phenomenon, random occurrence and largely unexplained. It also referred to as watermarking, pooling or puddling. A cut pile carpet may have shaded areas that are lighter or darker than the surrounding carpet pile. It is not unlike the brushed appearance that occurs on fabrics such as suede or velvet.

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