Installation was over wonder board, waterproofing was applied and allowed to dry for days, a white adhesive for shower walls was applied and tile set. In the shower 6 ceramic tiles are showing dark marks. I have a newly remodeled (complete gut out) bathroom. If moisture is the problem then you have to stop the excessive moisture, which you might be able to do without tearing the whole shower out, or you might have to replace the shower Stopping the moisture might not allow you to remove the stain because it may be trapped in the tile itself. To dry to remediate the problem you have to treat the problem, which is excessive moisture, and not the system, which is the stain. Or it is a mineral imbalance that causes the staining. Moisture is likely trapped behind the wall and there is some sort of organic food so that a microbial growth develops that will stain the tile. Normally if you have a staining problem, it means you have a moisture problem. Purple Cyanurate is a chemical/mineral imbalance problem, and is not an "organism" or algae problem. There could be a purple color microbial growth developing in the tile body that shows through, or it could be mineral staining. There is a chance that the pink tile has the same condition, but the pink glaze is opaque so you can't see the underlying staining. The tile glaze is translucent so when the underlying tile clay body gets wet or stains it shows through the surface glaze. Do you have any idea what could be causing this stain and is there any way to clean or restore these tiles?ĪNSWER ANSWER - Since you don't see the purple stain in the pink tile, but you see it in the white tile, and you can't clean it, it sounds like you have a microbial staining or mineral staining showing through the white tile.Īlthough it is not common, some glazed wall tiles are somewhat translucent and porous. None of the pink tiles in the bathroom have this problem, just the white ones. It's like some kind of chemical reaction is going on in these mass produced tiles. The tile next to that one has the exact same stain, and a few tiles away there is another tile with that pattern as well. For example, one tile has a group of blotchy dots in the left hand corner, then a couple of vertical streaks, followed by more dots and smudges across the top of the tile.
Now the problem seems to be spreading to other tiles, and the other day I noticed that the stain follows the exact same patterns across several different tiles. The purple color is ingrained in the tile and will not come off no matter what I try to clean it with. When I first moved in about 15 years ago, a few of the white tiles had a strange purple stain on them that I thought might be the result of past mold problems or damage from cleaning products. The rest of the bathroom is 1950s pink tile (walls and ceiling), but the white tile in the shower stall looks like it was put in later to replace some of the older pink tile. I have 4x4 inch white ceramic or porcelain (not sure which it is) tile in my shower stall and very hard water that makes it difficult to keep clean.
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