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Discuss Grout Dye in the Australia Tiling Forum area at TilersForums.com.
I see now, got the wrong end of the stick, no, would be the answer to that one, sorry.
What about a dye that brickies use in mortar, maybe that could work, never done it myself but you could try on a sample at home
Reply to Grout Dye in the Australia Tiling Forum area at TilersForums.com