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Laser Approx
Where from is the so called "yellowing" of stone surface after stone cleaning with a laser?
After cleaning the surface of a stone with a laser (at specific parameters) it has been observed that the original surface of the stone is yellower than it should be. The temperature in the spot of cleaning with laser is @ 25 gr. Celsius. And the cooling time of the spot area is approx. 1-2 s. OK, maybe 3 s 
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I'm not sure if anybody really knows for sure, that's why I'm asking for oppinions. 
10x.
An article titled "A Short Bibliography on the issue of yellowing and other side effects during Nd:YAG laser-cleaning" can be found at the website listed in the source section below. I believe after a brief review of this amterial that it addresses the situation you describe fully and provides an adequate explanation of the processes involved.
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ZR3 owns Houston PD Pro Laser 3 . . . again.
Does laser tattoo removal actually work?
I got a tattoo when I was 16. BIG misatake. I really want to have it removed. Does laser tattoo removal actually work? If so, will it get rid of the tattoo completely or will I be left with some scarring? The tattoo is approx 5cm x 2cm and contains only a tiny amount of red ink (the most difficult colour to remove, I believe)
yep ur right, red is the hardest to remove, black the easiest. I have had one removed ( a black one) and it did completely disappear.. took a while, but was worth it, no scars at all ( i have a new tattoo there now!) Its becoming cheaper now too which is great... Tho really hurts! Tattoo's are nothing compared to removal for pain!
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