Monterey LG1142 Spray Solution Colorant Mark-It Blue Dye, 15.9 Fl Oz (Pack of 1), WhiteBrand: Monterey Color: White Features: SPRAY IDENTIFICATION After applying insecticide, herbicide, or fungicide to your lawn or garden, use Monterey's Mark It Blue Spray Solution Colorant to indicate where you have applied a chemical spray. AVOID OVERLAP By utilizing the Mark It Blue, you will be able to avoid overlapping sprays as well as ensure that you have applied the chemical to all desired areas. It works great with Roundup or Remuda,