By automatically refilling liquid color drums during molding or extrusion process, RGInfinity™ Auto-Refill System eliminates downtime for switching drums and minimizes transitional or off-specification product with little or no color. Sealed connections throughout system keep liquid color completely sealed off from workplace. Each drum is mounted on Riverdale Gravimetric Stand, which monitors weight of color in drum and signals pump valve on tote when drum is nearly empty and when it is full.