According to the manufacturer, the Monterey Mark-It-Blue will break down in direct sunlight and will dissipate in 2-3 hours. The Mark-It-Blue may also be used on your home lawn.
Yes, Monterey Mark-It Blue is a non-toxic, food-grade pigment and washes off without staining.
Monterey Mark-It Blue is a spray solution blue colorant that indicates where you have applied a chemical spray. It works great with herbicides, fertilizers, and insecticides. It washes off without staining, and it is non-toxic and dissipates with sunlight.
If accidentally sprayed onto cement, Mark-It Blue will wear off with time. However, it is best to protect porous surfaces with a tarp, cardboard, or other barrier so that you do not get any temporary staining. You can rinse areas immediately with water to remove any colorant more quickly. Be extra mindful of sensitive stone and fabric as these may stain permanently.
Monterey Mark-It Blue will stain concrete and other surfaces so it would be best if you cover them if possible. If there is any overspray, be sure to rinse the area as soon as possible.