That is exactly what causes carpet to yellow.
Why does carpet pad turn yellow.
This is simply memory foam s way of oxidizing.
It was traced back to the cushion and pressure from the mills put an end to it.
Why does your carpet turn yellow.
While this has been stated as a cause of browning and yellowing in carpet it has not been used in the manufacture of carpet in over 25 years.
Another very common cause for a floor to yellow of become discolored is too much cleaning chemical.
It should be noted here that there are many other causes of yellowing conditions in carpets see carpet yellowing.
Yellow discolorations develop slowly by the transfer of trace amounts of asphalt residue through the accumulation of thousands of footsteps.
The kind of yellowing is noticeable because it is a very bright canary or legal pad yellow.
These large pieces are often set in a room to help decorate then left there.
Antioxidants used in the manufacture of rubber and petroleum from exterior asphalt sealants and or spills tracked in on shoes and casters may cause permanent discoloration to any resilient floor.
Like a penny gets darker with age this is completely natural and in no way detracts from the effectiveness.
If you want to get technical it s not actually the sweat that is staining your pillow but rather a compound found within it urea.
If there is no sun exposure on the flooring then that portion of the floor will begin to oxidize creating a yellow discoloration on that particular area of the floor.
As the sweat dries it leads to yellow stains on your pillow.
It could be sand but it also could be the fillers and latex from the carpet breaking down.
1 the yellowing is gradual and you may not notice it for weeks or even months.
Your carpet might have a compound in it called butylhydroxyltoluene otherwise known as bht.
This excess residue is sticky and will attract soil from foot traffic.
Yellow stains indicate reactions caused by strong oxidizers or bleaches.
All memory foam turns yellow with age.
Green or blue stains may indicate sunlight combined with a catalyst.
I also have run into a lot of stuff between the pad and carpet where the customer was using alot of the carpet fresh stuff.
Urea is what is responsible for yellow sweat stains.
Adding too much cleaning chemical to your cleaning water will leave excess chemical residue on the floor.