There are several ways to eliminate the white residue in the black grout lines. First you may want to add a stone soap to your rinse water. Stone soap will clean the grout lines. If this proves ineffective you can add a small amount of black dye to the polishing powder. The dye will mask the color of the polishing powder and will blend into the color of the grout. Dyes can be purchased at concrete supply companies. If you use grout or concrete dyes, be careful that the dyes do not stain the stone.
Article ID: 418
Created: January 19, 2022
Last Updated: January 20, 2022
Author: Pam Freitag
Online URL: https://sr-manual.com/kb/article/i-am-polishing-a-black-marble-floor-and-am-having-trouble-with-the-grout-lines-the-polishing-powder-is-leaving-a-white-residue-in-the-black-grout-lines-and-it-is-difficult-to-clean-them-do-you-have-any-suggestions-418.html