Abstract: Colors On Demand (COD), a method and system for automatic and instant custom colors blending and producing personalized coloring products, including but not limited to cosmetic coloring products (nail polish, lip coloring product, eye make-up coloring product, hair coloring product); colored pen products; paint and dye products to the specific demands of customers, specially matching with the colors of a certain personalized object or with the personal preferred colors or fashion trend colors. The COD system is further using intranet, extranet or internet wired or wireless network in an E-commerce environment with web based color matching, coloring product selection and online payment mode to be incorporated in the click and mortar business model from a pull purchase mode of personalized coloring products at the point of sale.