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Unread 03-07-2007, 05:52 AM   #1
danedaddy25
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Absolute Black Granite OR NOT?!?!?!?!?!?!?!

has anyone seen sulfamic acid affect absolute black granite. Installed a floor and needed to clean salt deposits from the grout joints. Now, after using sulfamic acid i have grey lines or "burn"? marks along all the grout joints. Any reasons AND any solutions? please advise soon before my customer kills me!!!!
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Unread 03-07-2007, 06:58 AM   #2
GraniteGirl
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Depending on the origin and nature of the "Black Absolute" you got, it is indeed possible. Some stones being sold as BA actually have calcium content that could etch if exposed to acids.

Impostors are a big problem with this stone and not many reputable companies will even sell it if they are not 100% sure that it is indeed the true BA.

We always advise against the use of any acids with natural stone.
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