3X Blue Marker Dye (Makes 32 Gallons) - Triple Concentrated Spray Pattern Indicator & Turf Grass Mark - Pair with Surfactant Liquid for Lawn Spray Mixes (8 oz)

Works but messy.

I dropped the bottle on my kitchen floor. The bottle broke and it took 4 hours to clean up all the blue. It did NOT dye the floor thank goodness but now it’s been a week and if I walk barefoot on the floor my feet turn blue even though there is no blue visible. I’ve mopped 3x a day since the original spill and the water somehow still turns blue. Luckily it seems to wear off of everything after being in the sun for a day or 2. The towels I hung outside faded the blue out and are white again after being in the sun

Product does the job. I was very impressed with their customer service department. I was delivered an empty package, for whatever reason and when I contacted them, they replaced it a couple of days later.

Mixed as directed ,spraying weeds on bare ground or gravel the color can be seen where you sprayed or did not, it looks more GREEN than BLUE ,, on tall broadleaf weeds the BLUE color turns GREEN very quickly, in 15 minutes you can’t see any BLUE at all on the tall weeds. Making it impossible to determine where you previously left off, ( if you need to mix up more spray to finish )

Dies fine, you can add some more to ratio if you need a stronger contrast but it does as you would expect