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butter London is a 3 Free Nail Lacquer. Which means it has NO Formaldehyde. NO toluene. NO DBP COlour, not Carcinogens. That is the stuff thought to cause cancer. Whether or not that is true, this is the best nail polish I have tried. It has such a cute bottle. You pull the cap off and under that is the screw top. It goes on so smooth and easy. They have such a wide range of colors as well. The color is so rich and pigmented. Its a bit on the pricey side of nail polish, but its totally worth it!!
Source link: http://www.butterlondon.com