QoR (pronounced core) watercolors feature Aquazol, an advanced water-soluble binder that allows for greater pigment loading than traditional watercolor binders, resulting in vivid depth of color in every brushstroke, while retaining the versatility of traditional watercolors. The binder is used within the conservation community for painting restoration, and is more flexible and less brittle than traditional watercolor binders, offering improved flexibility and adhesion. Seasoned watercolorists and beginners alike will love the intense color palette, smooth transitions and glazing qualities of this QoR watercolor set! This set includes: Hansa yellow light, pthalo blue, ultramarine blue, pyrrole red light, permanent alizarin crimson and burnt sienna (natural).