The light looks like its tell us, some kind of phosphorus material?

Maybe soap or something that was used to make the vacuum cups lock better?

Not sure but different materials light up under a UV light.

Hector Castillo  

Hey guys! Thank you SO much for the feedback on the side of the house! We are working on discussing their options and doing some samples. 

Here is something I have never heard of… They have 3 rings you can see during the day, we thought they were stains, so had the homeowner try policing them with no luck. Here is an email from her :

“I think we figured out what caused it. I thought a pan lid or the pan itself since it was a round ring about an inch wide. Well my husband remembered that when he went to pick out the slab they were using large plungers to move the pieces. He took out a black light and the granite is covered with round rings, all the same size. I know it's from nothing we did because they are even on the backsplash and on a second island that I never put pots on. Ironically only 3 rings show up under normal light. Any ideas on a solution?”

I asked if she could send them with the black light – see the photos below. Thoughts??? Thanks!!!

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