TurfMark Blue dye spray indicator concentrate. Add a small amount to any liquid insecticide concentrate, herbicide or fungicide and see exactly where you’ve sprayed. Turf Mark Blue is mixed at a rate of 1/2 – 1 oz. of concentrate per 1 to 3 gallons of liquid insecticide. Turf Mark spra indicator dye is mainly used for pre-construction termite treatments to mark where the termite spray was applied, such as on wood studs or foundational wood or concrete, and with herbicides and fungicides to see where you’ve sprayed in the lawn. When applied to turf, the dye disappears within 24-48 hours. Do not use for general pest control treatments around a home as the product will stain and can be difficult to remove.