Disclosed are thermally-stable, anthraquinone colorant compounds which contain one or more vinyl groups which render the compounds copolymerizable with reactive vinyl monomers to produce colored, polymeric compositions such as acrylate and methacrylate polymeric materials. Each group has a plurality of nozzles discharging liquid as liquid droplets. Various electronic features including safety lockouts and burner re-ignition are provided, as is relational control of the burner flame. A switching device is included to switch from one of the battery packs to the next battery pack. Also coupled to the system control board are a first switch and a second switch.