Its likely been mentioned above, to get that effect its so simple its actually difficult.. Base color-whatever ya want. Lay a silver over it or any lighter metallic, the effect looks good with golds and such as well (Also mentioned above I think)..Then just one candy layer at a time..Put enough layers on you get to black or near black..Thats when it looks really deep also and thats the effect most high end jobs go for, depth created by multiple candy layering. its easy in the sense it just a case of continually spaying until you reach the depth/darkness you feel required, hard in the fact that its not as easy as picking up a gun and doing it and it can get expensive..Worth trying perhaps the metallics posted but you will not get the full depth of a candy over a metallic. Similar effects can also be created with the xcrylic style paints, especially mutli color change and especially in the right light, these can be laid on top also of metallics or plain light bases or even black and come in golds, mother of pearl, blues, purples and greens. They spray on almost clear but when it catchs the sun in just the right way, it will make it almost glow....Good luck