MONTEREY MARK-IT-BLUE, 8 FL OZ

Nice shade of blue that visibly helps you see where you have sprayed. Not much else to add other than it does its intended purpose very well.

I use this product to mark chemicals on cut buckthorn stumps to kill it

Works pretty well in general, but its visibility depends greatly on what you're spraying. It is very hard to see the blue dye directly on dark green leaves, but it shows up great on, for example, broken stems, or pavement, or straw, etc.

What is nice is that if it gets on a surface you don't want it to (such as the kitchen cabinets and countertop - long story) it does wipe off easily by using Lysol Surface Spay.

very deep color

Works great to mark where you've sprayed. Especially good for spot treating weeds, So you know which weeds you've already done

The amount of product recommended per GL of water does not come close to doing the job. Using the recommended quantity does not create a very good visual distinction of the sprayed area specially against the Green grass. You are able to see once you walk away from the area and look from far away. This defeats the purpose as you need to see where you spray from close range as product is being applied.

The color does what it is supposed to adding color to Herbicide, and I give it one-star durability to indicate that it fades fast, which I consider a good thing. Two-star for value for the money because the 8 FL OZ bottle isn't going to handle a large area. I live in AZ, we have decorative rock landscaping front/rear yards, and absolutely no grass. It takes five gallons of spray to lightly cover my entire yard. I tried mixing at half the recommended colorant 0.5 FL OZ/gallon and that is sufficient to mark while it's wet and when it dries it's invisible. So, I had to scale back up to 1 FL OZ per gallon because you want to be able to see it for at least two days after application.