Re-Colouring Grout

[Bhoystris]

Can anyone tell me if they have used a product by aquamix called grout colorant? It is supposedley used for changing colour of existing grout. I was wondering if this would be any good as i have had a request to do some re-grouting for a lady who had someone else tile her bathroom a couple of years ago. The problem being the white grout has turned a yellow colour. Any knowledge on this product would be a great help as i wont be raking out all that grout.

 

[DHTiling]

when you say the grout has gone yellow check that the customer hasn't been washing the tiles with bleach..turning yellow like that is a sign of bleach burning..and i dont think a re-colour will take..check first before commencing re-colour..just to be on the safe side..good luck ....