Lemon Test Turns Absolute Black Granite Gray


Should black absolute change colors when lemon is set on it for 20 seconds and turn to a light grey color?

The sample black absolute granite slab piece I have does not turn colors no matter how long I leave lemon on the piece it wipes off and looks like new.

However the "polished black absolute" counter just installed has a gray streak in front of the sink area and when I performed the lemon test on the rear of the counter it immediately turns the spot gray.

The installer contacted his supplier from "India" who told him it is not a doctored product and I quote.

"But I can guarantee that it not doctored or painted. All the Black Absolute granite countertop slabs ( including What MSI sells) has Neroplus Epoxy expect the Warangal black. But Warangal black have white dots.

Regarding Lemon test - for any acid the colour will change. Even if you put in Madura gold any other. Granite the colour will change but in Black material it will show more."

HMMmmmm so all of his slabs have Epoxy resin on them and WHY? Because they are inferior products and need to be sealed and baked to be made sellable.

And why does my sample piece not turn gray when the lemon test is performed but the new granite that was substituted for the slab I chose does turn gray?

My granite countertop seller/fabricator says there is nothing wrong with this slab and he is not going to replace it. What do you think?


No matter what product you are buying the actual product performance should match that of the sample... including granite countertops.

So, there IS something "wrong" with your installed countertop.

If the sample Absolute Black did not etch when performing the lemon juice test which true AB won't) then the installed product should not etch either, otherwise it's just a bait and switch.

Now, I doubt your installer did this purposely unless your sample was broken off the exact slab you were considering purchasing, which is the only way to take a sample for testing.

Testing a pre-made "sample" that is designed to be a general representation of Black Absolute (or any color) is pointless.

You have to test the exact granite slab. If you did this and got something different, then the fabricator installed a different slab than the one you chose and that is clearly fraud.

But even if you did test a pre-made sample, the fabricator was providing this to you as a representation of what you would get and is still culpable (my opinion... not a legal certainty).

True Absolute Black granite comes from South Africa.... not India.

However, many black granites are now coming out of India that are not good stones, often etch, are doctored or are otherwise of much lower value than AB, but they name the stones "Absolute Black" because you can charge a bunch more for AB than the crummy look-a-likes coming out of India and sometimes China.

Would be no surprise if your fabricator/stone warehouse is clueless to this point.

The granite may not be doctored... you can find out using the FORENSICS Granite Test Kit... but it is not true "Absolute Black" either.

Just FYI... a resined stone is not necessarily of inferior quality. Applying a resin is simply a process to fill voids and other imperfections that are impossible to avoid in a natural product.

So yes, resining makes a stone more "sellable", but it is an acceptable practice that typically does not change the color or performance of the stone other than to make it less absorbent and improve stain-resistance in many cases.

Resining is likely not the issue here. A resin could react to an acid. But, probably you simply have an inferior quality "black" granite that is mis-named purposely so by the Indian supplier and possibly also mis-represented to you by the fabricator.

I'd withhold any remaining payment and consult a lawyer if the guy won't make it right. You may be stuck in small claims court if the dollar amount isn't high enough, but a lawyer can at least provide the legal argument.

Obviously, etching significantly affects the expected performance of the granite countertops.

granite countertop cleanerGood Luck,

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Oil Test on Uba-Tuba Granite

by Kathy


Thank you for a great site! We moved into our newly constructed home 2 months ago. We have Uba-Tuba granite countertops. I did the test you recommended and the oil darkened the spot immediately which I was not expecting.

When I cleaned off the oil with dishwashing soap and water, I could not tell where the oil had been. Am I doing something wrong? Did the spot only appear darker because I was looking at the countertop through oil?


Kathy, thanks for the compliment.... lots of good info is the goal.

Your assessment is quite likely true, since oil is rarely clear.

Uba Tuba typically doesn't need (won't take) a sealer, so it would be highly unusual if the oil absorbed instantly.

Really, you can use plain water to get accurate results with this test. (I should probably edit that page)

Re-do the test with water on a few scattered spots around your countertop. Most likely the water puddles won't darken (or will take 15+ minutes) and you won't have to seal.

On the other hand, some uba tuba will need sealing, so if you do see the spots darken in 10 minutes or less, then one coat of sealer ought to do the trick.

I'd use one of these recommended marble & granite sealers.

Good Luck,

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