Grouting going off colour

[Italy]

Antonio, that’s not just in the mornings mate ! 😛

I always hope to gain the English accent.
I do not give up

 

[Old Mod]

I don’t think that’s an issue with the pigments not mixed right, I think that’s a problem with over washing or washing too soon, or both.

Well the reason I would say it’s not efflorescence is because a symptoms is that the grout is lightened in appearance, not darkened.
As the original colour is smoke grey, which I believe to be quite a light shade, you wouldn’t be getting the dark shades If it was suffering from salt deposits.

 

[Flintstone]

Ahh, I’m not familiar with smoke grey so not sure what colour it’s sipposed to be but those really light almost white patches must be efflorescence

 

[Bill]

I always try and 'peg' the grout joints with these new grey grouts and that seems to stop any shading issues. If the joints are narrow like these, then I would just let the grout firm up a lot and then rub the grout joint with a fluffy towel. That works too.

 

[ttt tiling]

One swipe with a sponge and that's it
No more washing till next day
Find it a git to use but mapei always seems to dry consistently

 

[WetSaw]

I always hope to gain the English accent.
I do not give up

Make sure you get a proper English accent, not a bloody Yorkshire one!