If this process is applied to a white marble floor that contains moisture it will turn the marble yellow.
Marble shower floor turning yellow.
It appears to me that the sealer is decomposing.
This oxidation process is accelerated when the tile is saturated as in the flood in the above example.
I was able to scratch the brown away with my thumbnail revealing the original beautiful marble.
If the gel coating has worn down a bit the coating and cultured marble may become stained.
Why is my white marble turning yellow.
I had used a commercial sealer on my marble before using my shower for the first time about 3 years ago.
Step 2 move the shower curtain and any fabric items such as bath mats towels and washcloths into a safe location.
If these deposits are exposed to water they can rust and leach through to the surface causing the yellow brown stains.
The loss of the high polish on certain marble and granite can be attributed to wear.
If this process is applied to a white marble floor that contains moisture it will turn the marble yellow.
The classic look of a bianco carrara or calacatta gold bath is popular and the current availability of field in a variety of finishes and textures like honed polished tumbled hand antiqued marmo antico brushed etc moldings and mosaics allow for many design options.
The bottoms of ones shoe acts like sandpaper on a stone floor surface and over time will wear the polish off.
A yellow brownish stain has begun to appear on the marble bench slab.
It started out faint has gotten brighter and appears to be growing.
Cultured marble may yellow over time for various reasons.
Get rid of nasty yellow stains in your plastic bathtub using hydrogen peroxide.
To remove yellowing due to a wax or coating buildup the marble will need to stripped with a commercial wax stripper.
It is for this reason that we recommend not using white marble in a shower.
Iron deposits that are embedded in white marble tile especially carrara marble are typically the cause of this type of stain.
I would strongly suggest having this done by a professional.
In fact waxy coatings of urethane and other materials may be the reason your white marble floors have turned yellow see it here.
White marble tiles can remain for years without yellowing then over time may slowly turn yellow and in severe causes may turn completely brown.
Another possibility is a process sometimes used for polishing marble floors known as crystallization.
This is especially true of marble since it is much softer then granite.
Mostly where the water hits the tile is turning brown.