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Black Limestone or Sandstone
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[QUOTE="Saltrock75, post: 618074"] Thank for getting back to me and I did ask if the slabs is slate and was told it not slate, indian sandstone. It seem to me look like Kota Black Limestone. I wasn't told anything about the care info but was advice to have a sealer on. they didn't clean up the cement stains after filling in the grouts and been raining a lot recently. I wonder if the cement stains damange the patio and edges too over a couple of weeks? I have been trying to get builder come back and clean up the cement stain but he too busy and will get back to me when he is free?! How do you tell the different between a slate, limestone and indian sandstone? Found this from Pavingexpert website about cleaning, see below... [h=4]Stone paving[/h] Most granites, basalts, porphyry, slates and quartzite seem to be unaffected by acid or acid-based cleaners, but process with caution and test a small discreet area first. York Stone, Pennant Stone and Liscannor are variable: some pieces will exhibit no reaction to acid or acid-based cleaners, while others will turn orange. It's related to the iron content, and as this varies from stone to stone, it's best to test before committing larger areas to acid cleaning Indian sandstones, Limestones, Marble and Travertine: avoid like the plague. Many of the paler Indian sandstones exhibit a violent rusty reaction to acid, although the extent of the reaction does vary from stone to stone and from quarry to quarry. Limestone is dissolved by hydrochloric acid - one of the definitive tests used by geologists to confirm a particular rock as a limestone is the effervescent reaction to hydrochloric acid. Marble and travertine are metamorphic limestones, so they, too, are best kept well clear of acids. [/QUOTE]
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