Carpet Browning is a directly related to the process of wicking. This is when the carpet gets wet from cleaning, and the deeper parts of the carpet fibres absorb all the excess moisture. The deep parts of the fibre then push that moisture upward with evaporation to the surface of the carpet which causes browning of your office carpet or carpet tiles
Like the wick of a candle, when a candle is lit, the flame burns the wick down and then it goes out. The carpet makes a reverse wicking bacause the moisture is pushed up the fibre and reappears as a recurring carpet stain.
If you have tried to clean a carpet stain again and again, only to see the same stain coming back, then this is due to the cleaning method you’re using and which is why this is happening. The solution is to properly dry the carpet after the cleaning products are suctioned out.
To guarantee complete moisture removal, place a bunch of absorbent paper towels or a regular towel on top of the wet spot then place put a heavy item on top to weigh them down on the carpet. Leave them to do their work for at least 1-2 hours.
After 1-2 hours, use some baking soda over the stain up. The baking soda will absorb the remaining moisture that may resurface, also it acts as a deodoriser for the carpet.
Wait around 1-2 hours, then vacuum the area of the baking soda.
Your carpet will be dry and you will have prevented wicking.
The reason this happens is because any carpet which has dark brown hessian backing runs the risk of browning. Normally acrylic mixtures are more likely to brown because the water absorption of the man-made thermoplastic fibres is very low, therefore there is a far greater tendency for the water to seep down to the hessian backing. The dye in the hessian is then loosened and wicks up the pile fibres giving an unpleasant brown patchy effect. Wool pile carpet tends to hold the relatively small amount of water, therefore, the water does not seep down to the backing so easily and wet the dye to stain the carpet.