This is a great product to use when spraying weed killer. You can see where you have sprayed. You just add it to the spray in the sprayer.

Worked as described

Very concentrated. Works great.

First off - open very carefully - OUTSIDE! It’s a nice blue but, you can’t even begin to imagine the level of damage you can cause being “in a hurry”

That said, I really wasn’t expecting much. I added it to a yard sprayer with roundup weed killer (save grass).

I’ve done before without dye. I used 3 refills of herbicide

This time being able to see where I had sprayed preventing excessive overlap. I was able to do with only 1.5 refills. Since concentrated Herbicide is expensive!! - I can see an instant savings.

It also washed off side walks or near house after first rain.

This is the first dye I've used, I've always leaned towards hand sprayers for weed/herbicide spraying because I don't want to overuse the product. Invariably I would be unsure if I had sprayed something and I'm sure I was overapplying on some and missing others. I was excited to learn these dye products existed tp help mark what has been sprayed and what hasn't.

The Blue dye works well, its very clear what has been sprayed and what hasn't, but blends well enough with the green grass that the lawn isn't an eyesore for the day or 2 it takes to fade; that is, your lawn looks like a darker green, not painted blue. I have noticed wood splinters in the yard that soaked blue are slower to fade, so be careful around a pale mulch. I would suggest wearing gloves while working with the product, it stains the fingers and is not easy to wash off.

Overall very happy with the product and will keep using it.