try an acid first then id bleach the limestone to rid it of the red..... Red is strong dye but if its in a stone you wont hurt the stone bleaching it....Customer's basement flooded and caused orientals to bleed into limestone. Would a poltice work to remove this? Any suggestions would be greatly appreciated.
Thanks for the reply Scott. Did you cover it with plastic or was the poltice itself enough?I would disagree about using the acid.
We did a couple similar with an application of StainZone, which contains hydrogen peroxide and surfactants, and then covered with a poultice. I think I show photos of one in my Stone and tile cleaning manual.
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Thanks for the reply. Should I use an oxidizer or a reducer first? Or does it even matter?Warn the customer that the process of removing will likely etch the surface resulting in the need for polishing. Peroxide is 2.5 pH and will etch stone. It will not do it as badly as a normal acidic cleaner but will do some damage.
You could try a sodium percarbonate product like our Boost All. You get the peroxide without the acid (pH 10). Mix it up at a 2 ounces per gallon of hot water. Try in a small spot and let it work for about 20 minutes to see if you can be successful. I would then mop it on from an open bucket.
You could also try Red Zone Ready which is a reducer at a pH around 7. Make sure you thorough rinse the stone to dilute and neutralize any remaining peroxide. You can try in a small area. If it works then you can spray over the entire area.
We used that in a dry climate (Utah). If the humidity is low or the spot is where there is air flowing such as in front of an HVAC vent, cover it with some plastic wrap. In many cases that is not necessary.Thanks for the reply Scott. Did you cover it with plastic or was the poltice itself enough?