Mark-It Blue Dye SprayMonterey Mark It Blue Concentrate Dye Marker 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 Shop with confidence when you shop at Southern Agriculture. All of our items are in stock and ship from Tulsa, Oklahoma. If you