What sort of coloring agent and how much do you use? I have an issue in larger areas being able to ensure I sprayed the entire thing with minimal overlap. I have considered dyes, but never looked into it too far.
I've been using Terramark (blue) for several years. For spot spraying, it's excellent. For general, area- spraying it's still pretty good but you do have to look close to see it on leaves and grass. I had some freebie herbicide given to me last year that had red dye already added. I don't think the red showed up any better than the blue did.
Even if you don't like dye for seeing where you sprayed, you should still add it to an herbicide mix in order to get a thorough cleaning when you flush the sprayer tank, hoses, booms, wand, etc. As long as I can still see blue in the rinse water when I'm cleaning the sprayer, I know that there's still herbicide present.
This is most important when different herbicides are used to guard against spraying residue from left-over herbicide from prior uses that could injure or kill non-target species.
And the dye is not permanent. It goes away after a short time and launders out of clothes. I've spilled drops on my concrete driveway and after a week or so, there's no trace of dye. The stuff is potent, though. A gallon goes a long way.
My buddy tried some for the 1st time this year. He opened the jug and then it slipped out of his hand and fell straight down and dye shot straight up and all over him
He looked like one of the "Blue Men"!:emoji_ghost::emoji_joy: He ain't blue anymore, it eventually washes off.
Keystone Pest now sells this dye...
https://www.keystonepestsolutions.c...id=270&zenid=a2199224229416c5ffe13692a993ce28