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.Shows where you've sprayed Eliminates waste Mark-it blue will not permanently stain vegetation or soil and can be used with all types of equipment Spray solution blue colorant that indicates where you have applied a chemical spray Works great with roundup or remuda and other herbicides as well as fertilizers and insecticides Avoid skips and overlapping, washes off without staining, is non-toxic and dissipates with sunlight