[wayne zabel]

I did a carpet in a modern apartment on saturday.It was a polyprop low profilish and stuck down to the floor.

There was a large area of the carpet about 5x3 ft that was rectangular in shape and quite uniform and was darker than the rest of the room.At first I thought it was a large stain but nothing I did made it any different.I tried HWE,I then put some Microsplitter on a small patch of it and rubbed with a towel.No transfer at all.

Could it be an area that has maybe had a rug or table there and the rest of the carpet has gone lighter in shade and so makes that area appear dark.The apt hasn't been built that long........would a carpet go lighter that quick?Any other idead what it could be

Certainly hasd me confused,

[davep]

Some apartments in city centres can suffer with a lot of polution that gets into the carpet and so can get dirty quick, most prob a rug thats been taken away.  Just put another one down and job a goodun 

[cannon]

Just an idea.....could it be a shadow??

The time ive spent scrubbing away and its turned out to be a shadow

Mainly when i first started but if im honest it still catches me out odd times.

[Steve Chapman]

its possible a rug has been there previously and dye from the backing has transferred to the carpet

after being there for a long time, have seen this a few times and normally impossible to remove,

Regards
steve

[Mike Halliday]

i've forgotten its name but could it be BHT(?) yellowing. where a rug naturally oxidises in the atmosphre releasing a gas which discolours the carpet.

but my first guess would be the rest of the carpet has faded.

[Phillip Mold]

Agree, sounds like the rest of the carpet has faded