[jamesjames]

  Yesterday I went back to clean the lady's bedroom carpet and also to sort out my browning problem from last week! I have taken advise from you guys & girls and bought some debrowning powder, I'v been very anxious all week. When I arrived the carpet was fine, no marks at all. I am very pleased because I was devistated for me and the lady to think I had caused such a problem, but could anyone tell me what this was??? and thanks to all who gave me advise.

[carpetclean]

sometimes you find old stains that appear when wet extraction occurs and then disappear when dry. i had this in a rug i did when someone was sick on it. when the carpet was damp you could see the patch where it was definitely stained [ looked like browning] and once i turbo dried it it vanished, but was obviously still there but not visible

[AJB]

It sounds to me as though the pile is thinner and
shorter on the walkways, and a shading effect from
the backing was showing whilst still damp.
As soon as the carpet was properly dry, the translucence
of the pile diminishes and the effect shows a lot less
or often not at all.