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Absolute Black
Real or Dyed Black?
Copyright 2011. All rights reserved. Granite Shield is a registered trademark.
The original quarry that Absolute Black granite came from was from South Africa. That granite
was so dense the granite didn't need to be sealed to protect it from staining.

In recent years Absolute Black granite has become very popular and China and some other
countries started exporting Absolute Black granite unfortunately in many cases it's not the same
dense Absolute Black granite that was coming from South Africa. The Absolute Black granite that
has been coming from other countries is dense granite but in many cases isn't really black but a
gray calcite based stone such as marble that will etch like marble leaving gray rings and spots
should acidic liquids come in contact with the stone. Many have dyed these gray stones to make
the stone black or more black.

To be assured you are purchasing a true Absolute Black granite all you need to do is a simple test
by pouring a little bit of lemon juice onto the Absolute Black granite and should it turn gray the
stone is not a true Absolute Black Granite. In most cases it's not the fault of the slab yard or
granite fabricator because many believe they purchased a true Absolute Black granite and have no
idea the stone was dyed. If you have an Absolute Black granite that you do believe is a dyed
Absolute Black granite you need to protect it the best you can keeping it very repellent so should
acidic liquids come in contact with your stone it will repel the liquid for a period of time before
leaving gray rings and spots. It's a personal choice you may even like the appearance of the
Absolute Black granite even if it may be a dyed stone.
The Granite Shield process on calcite based stones will not prevent surface etching but will reduce
it about 80%. Acidic liquids, alcohol and vinegar can etch Absolute Black granite that has been
dyed, marble, travertine and limestone if left unattended on your stone surface. Water with a
lower pH level lower than 7 is considered acidic.

pH Values

Stomach acid 1 to 3
Lime Juice - 1.8 to 2
Lemon Juice - 2.3
Coca Cola - 2.5
Soft drinks - 2.5 to 3.0
Vinegar - 2.4 to 3.4
Apple Juice - 3
Orange Juice - 3.5
White wine - 3.0 to 3.3
Red wine - 3.3 to 3.5
Drinking alcohol such as gin, rum and vodka - 3 to 6 adding Orange or Lime juice will lower pH
Tomato & Tomato Juice - 4.2
Beer - 4.5
Coffee - 5.5
Normal rain - 5.7
Milk - 6.2
Saliva - 6.3 - 6.6
Dog urine - healthy is 6.2 to 6.5
Drinking water - 6.5 to 8
Water - Under 7 is considered acidic

There is currently no penetrating sealer that can stop etching on calcite based stones.
On what is believed to be Absolute Black granite etching may accure that leaves gray rings and
spots on the surface. A topical sealer is not recommended for natural stone because it blocks the
pores of the natural stone then can't breathe and the top coating can scratch easy. So what
happens to natural stone that can't breathe? Moisture gets trapped and can cause a chemical and
mineralogical change within the stone. This action of decay in natural stone may take form of
pitting, spalling, flaking and oxidation.

You want your natural stone to breathe or it will disintegrate.
Absolute Black Granite

Real or Dyed?