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  • I noticed this morning that the brand new shower I just had installed has a few tiles with strange faint grey circular marks in them. Very hard to see but it's pissed me off. Anyone any idea why this is.

  • Wrong type of adhesive staining the porcelain? I know it can happen with natural stone and I've never seen it on tiles but that would be my first guess. Maybe slightly porous tiles/fault with the glaze?

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