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The Flash retro-reflective pigment contains pure quartz particles of ideal ball shape. The manicure becomes visible in the dark when a beam of light hits the nails and then is reflected back to the source of light. The brightness of the retro-reflection depends on the power of the light source and the angle at which the beam hits the surface of the manicure. Your manicure with the Flash pigment will be the brightest memory of any party!