New grout different colours

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Hertfordshire
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I have recently had my bathroom re tiled but the Ardex fkexible grout used has dried different colours. In some places it's dark grey and in other a lighter grey (almost white). What caused this and can I do anything about it?

 
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Hi,

Did you get a his solved?

I have the same problem and finish of grout looks exactly same as your picture.
 
Not a tiler but the assumption is it was not mixed correctly before applying?
 
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It looks like effloresence (salt residue). Normally happens if there is too much water in the mix or excess grout wiped off too soon or the sponge was too wet.

Should clean up easy enough using a mild acidic grout residue remover, like the HG Extra or LTP grout stain remover.
 
Too much water in the mix or washed out the grout joint when cleaning.
 

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