Liquid Harvest Lazer Blue Concentrated Spray Pattern Indicator - 8 Ounces - Perfect Weed Spray Dye, Herbicide Dye, Fertilizer Marking Dye, Turf Mark and Blue 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