Liquid Harvest Lazer Green Concentrated Spray Pattern Indicator - 1 Gallon (128 Ounces) - Perfect Weed Spray Dye, Herbicide Dye, Fertilizer Marking Dye, Turf Marker and Herbicide Marker Mixes only with water based solutions, will not work with oil based Easily marks grass and lawns Mix with herbicides, fungicides, pesticides, & fertilizers Indicates where spray mixtures have been applied Non-permanent and nonstaining