Marrow, A dark, flat, murky & mysterious purple. A custom mixed colour for the designers at Vena Cava this season, who named it after the dark purple, rusty center of a bone. The High Price of Beauty? We don't think so. butter LONDON is a 3 Free Company. What is 3 free? Most major nail companies use toxic chemicals in their products. Why? Because they are cheap and unmonitored by the Food and Drug Administration. They are also extremely hazardous to humans, causing cancer, birth defects, neurological damage, and a host of other serious illnesses. butter LONDON products contain NO Formaldehyde, NO Toluene, and NO DBP (Dibutyl Phthalate). We believe in Colour, not Carcinogens. Made in USA.