TurfMark Blue dye indicator concentrate. Add a small amount to any insecticide concentrate 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. TurfMark 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. When applied to turf, the product 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.