QoR's exclusive binder provides more pigment in every brushstroke, while retaining the best qualities of traditional watercolors. QoR offers a strength, range and versatility unmatched i nthe history of watercolors. The unique formulation accentuates the luminosity and brillance of each pigment even after drying, while providing the subtlety, transparency and flow of a great watercolor. QoR (pronounced 'core' is an allusion to color as the center of watercolor painting. QoR also comes from a technical acronym meaning Quality of Results.