Gradia Gum Light Cured Composite Modifier G23-2.9ML Syringe. Gradia gum shades provides shades as seen in the natural gingiva. With this light-curing composite, gingiva tissues can be reproduced by means of basic or multiple layering techniques. This product is fully compatible with the GRADIA® micro-ceramic composite system. It also delivers unlimited possibilities for the characterization of acrylic dentures.