Black Shower Grout Turning White
Apply the grout stain to a small area of tilea 1 square-foot area is a good size.
Black shower grout turning white. It looks like a chalky substance is rising up through the grout. Use the toothbrush to work the stain into the grout. I dont want to say it will turn a dark grout white.
Excessive efflorescence is considered a symptom of an excessive moisture problem. In 3 bathroomwcs and a porch we have used Bal Superflex black grout on the floor. The mold usually grows in pH 3 7 depending on the type of mold.
Under certain circumstances a white powder can form on grout especially on floor tiles. Grout turning white can be caused by efflorescence which is the calcium from the water and the underlying concrete or mortar migrating up through the porous cementitious groutIf the water isnt draining away properly in the shower pan that cause be the cause of the excessive water that is causing the efflorescence. Go to the Aquamix website.
It conceals dirt on the surface and can have a dramatic effect. If you have a tile store near you they sell it there as well and they have samples of what it would look like. It will even lighten a dark grout.
Go to your local big box hardware store and ask one of the workers for Wet and Forget Shower. They sell grout colorant which you could probably find some to match your existing grout. All four areas were done at separate times and the grouting was done a few days after the tiles were laid.
Grout turning white can be caused by efflorescence which is the calcium from the water and the underlying concrete or mortar migrating up through the porous cementitious grout. There are over 30 colors to pick from. Grout turning white is usually due to efflorescence which the movement of salt or minerals to the surface of porous material such as your grout and forms a whitish coating.