I dropped something heavy and mildly pointed onto the bathroom floor.
The Bathroom is tiled with ~30cm square black "slate like" tiles, but where I dropped this thing, the surface has been badly (2-3 cm radius, ?1-2mm deep?) chipped, and underneath the tile is pale brown.
Since I chipped it, there has been moisture welling up, through the chip. Initially I assumed it was just from the object dropped (it was wet), but the chip is still wet, and if I pat it thoroughly dry with toilet roll, then it 'spontaneously' becomes wet enough to mark a mark on toilet roll again, in <10 seconds.
The rest of the chipped tile, the other tiles, and the grout between the tiles all seem fine; no darkness, claminess, or any other sign of dampness.
What have I done, and what do I need to do now?
I know nothing about the tiles in question and don't (to my knowledge) have any spares.