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are the tiles polished?
Fully vitrified Porcelain tiles have 0.05% water absorption rate , so water testing on fully vitrified tiles is pointless .
Polished porcelain needs sealing to aid cleaning as the sealer helps close the microscopic pores created whilst factory polishing.
Now you can also have dust pressed porcelain unglazed and these will show water wetting.
Dave
The point of the water test is to check. How do you know they are fully vitrified?
Kev