Add. Blend. Create! CND® Additives are the most innovative way to add creativity to nail services with unique and completely customized colors, textures and finishes. Cosmetic-grade Additives Pigments and Effects can be blended into sculpting powders or gels, or layered over CND® SHELLAC® brand 14+ day nail color to re-create top nail trends or designer nail looks from the CND® Nail Art Gallery.