A fully automated paint sample mixing and vending machine including an inventory section holding a plurality of containers with a base paint solution. The containers are individually dispensed onto a shuttle unit when a color is selected. The shuttle unit delivers the container to a capping unit for cap removal. After cap removal, the container moves on the shuttle unit to a colorant dispensing unit where various colorant paint solutions are injected into the base paint solution. Following tinting, the shuttle unit returns the container to the capping unit where the cap is securely reattached. The container is then delivered to a shaker unit where the container is rigorously shaken to mix the base and colorant solutions together to provide a uniform solution of consistent color. The container is then transported by the shaker unit to a delivery chute where the container is provided to the customer.