Grouting wall/floor how to avoid staining one colour of grout with other

[silver50]

Just a thought today, I'll be using a dark grout on floor tiles and feel concerned it'd stain the white wall tile grout. Still not done any grouting on walls as yet but vice versa the same risk seems to apply!

What's the usual method of avoiding this? Obviously will only do one after the other has dried but it still seems probable the fresh grout would stain the other.

Thanks

 

[foxhole]

Once set there is no colour bleed, do floor first.

 

[silver50]

Ok, thank you. Think I was probably more worried after my last floor tiling job, a hearth with weber black grout. It seemed to stain everything!

 

[foxhole]

Black grout is the exeption, buggers anything up.