ALLIGARE Blue Dye Spray Indicator Super Marking Dye 1 Qt Insecticide Herbicide Fertilizer Blue dye in an aqueous solution..100% May be used in the right-of-way with any other pesticide or fertilizer. 4 to 12 ounces per 100 gallons of spray solution. For smaller spray applications using backpacks and small sprayers, use 1/3 to 2/3 ounce, (approximately 2 to 4 tsp.) per three gallon tank.