Illamasqua Radium Nail Varnish(£13.50 for 0.50 fl. oz.) is described as an "acidic lime, shimmer finish" shade, which is new for the Toxic Nature collection. It's a beautiful neon chartreuse green with yellow undertones and iridescent green and chartreuse micro-shimmer. Though currently only available through Illamasqua directly, it should make its way to Sephora next month.