[davep]

2nd time ive seen this problem, you can see where the sofa sits, as well as the rug.  Carpet looks like its been burnt or something paranormal  :

Its all over apart from where the furniture sits, here the colour is perfect?

[M.Acorn]

Was it polly prop ?  Had one last week with similar problem, never seen anything like it before

[Jamie Pearson]

Could be fume fading.

Do they have a fire?

[Paul Moss]

UV

[davep]

No fire, too much and too dark for uv

[Jamie Pearson]

Near a bus stop or busy main road?

[Paul Moss]

I can see shaddow so plenty of light about for UV

[davep]

Approx 100 metres from a busy road. Would uv make it go so dark?

[Shaun_Ashmore]

Is it a wool mix?

I'd guess that one of the colour dyes is weak the darker dye then becomes more prominent or that the colour dye is weak and has changed in colour.

Shaun

[AJB]

Uv damage.
Polyprop takes on a greenish tinge.
Nylon turns black eventually.

[Paul Moss]

Synthetics can change colour pretty quick. I have a 5 floor building on yearly contract and the top floor has deep red carpets along the corridoors, most areas have changed colour to brown even the bottom end of the corridoor that has little light affecting it has brown  dark edges. UV plays wierd tricks with pigments altering the colours both lighter and darker.

[Paul Moss]

 I would guess more towards polyprop Shaun

[davep]

Yes polyprop.

[nevil]

I concur, UV damage. First time I saw it I was convinced it was soiling and would clean. Unfortunately I told the customer this too. Oops

[Paul Moss]

Shaun, think thats 10 nil now

[Shaun_Ashmore]

To me

Shaun

[davep]

I knew it wouldn't clean straight away, she wanted it doing anyways so job a goodun

[Jim_77]

Just looks like a really dirty bit where footfall has been, in between the like-new clean bits that have been covered

Photo too small to see anything really

[Paul Moss]

  you still have not cleaned enough carpets yet you pup 

[Jim_77]

Maybe need a bigger screen