I used this when I spray the weeds in my yard. this is the best price online. You only need a little and it will wash off and fade with direct sunlight, may take a few days but isn't permanent. This stuff is messy and the container has a large opening, so I find its best to find an empty shampoo bottle or squirt bottle to use as the main container and fill it up as needed. You're more likely to avoid messy spills that way.
Q: What is the color of this dye?Red River IVM Marking Dye