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Hi
A few days ago I liad white ceramic floor tiles, the next day dark patches appeared under the glaze , some tiles went completely dark , after three days the dark / damp patches have not dried out, the tiles wrer laid on thermal board with electric heat matt on top, rapid set https://www.tilersforums.com/forums/tile-adhesive/ was used as supplied by the shop, any ideas what has caused this and how can it be rectified.
Many thanks
A few days ago I liad white ceramic floor tiles, the next day dark patches appeared under the glaze , some tiles went completely dark , after three days the dark / damp patches have not dried out, the tiles wrer laid on thermal board with electric heat matt on top, rapid set https://www.tilersforums.com/forums/tile-adhesive/ was used as supplied by the shop, any ideas what has caused this and how can it be rectified.
Many thanks