Check the listing for details. Monterey Mark-It Blue Spray Solution Colorant Chemical Marker Dye, 1 Quart. Condition: New. Listed at 26.29 USD. Monterey Mark-It Blue Spray Solution Colorant Chemical Marker Dye, 1 Quart PRODUCT DESCRIPTION Spray solution blue colorant that indicates where you have applied a chemical spray! Key Product Details A tank spray additive with non-staining dyeShows where you have sprayed, eliminating waste, overlapping and indicates areas of driftWorks great with other herbicides, fertilizers and insecticidesWill not permanently stain vegetation or soilCan be used with all types of equipmentWashes off without staining, is non-toxic and dissipates with sunlight Monterey Mark-It Blue is a concentrated blue colorant designed to provide temporary highly-visible evidence of spray application patterns. Mark-It Blue readily dissipates, is non-toxic and totally compatible with water-soluble solutions. It is ideal for golf courses, parks, cemeteries, athletic fields, and any turf or grass areas, virtually anywhere where spray evidence is needed. Mark-It Blue will not permanently stain vegetation or soil and can be used with all types of equipment.