Use Bas-Oil spray indicator with oil-based herbicide solutions such as Garlon 4, and with hydrocarbon carriers such as penetrant-diluent (ULV oils, terpenes, diesel fuel or kerosene).
Bullseye Blue Spray Pattern Indicator (SPI) is a non-staining, blue liquid polymeric colorant. Its remarkable color strength and superior performance properties are a perfect fit for use in industrial vegetation management.