






🔵 Mark it, spray it, own your lawn like a pro!
Monterey Mark-It Blue 32oz is a liquid spray colorant designed to visually mark treated areas during lawn and garden chemical applications. Compatible with herbicides, fertilizers, and insecticides, it prevents missed spots and overlaps, enhancing precision and efficiency in outdoor care. Easy to mix and use with no assembly required, it’s a must-have for professional-grade lawn maintenance.








| Best Sellers Rank | #73,965 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #2,593 in Gardening Sprayers & Accessories |
| Brand | Monterey |
| Customer Reviews | 4.4 out of 5 stars 234 Reviews |
| Global Trade Identification Number | 00022179103825 |
| Item Form | Liquid |
| Item Weight | 1 Pounds |
| Liquid Volume | 32 Fluid Ounces |
| UPC | 022179103825 |
M**E
This product is FANTASTIC! I was skeptical about this product
This product is FANTASTIC! I was skeptical about this product, but I decided to buy it anyway. I have a really large yard/lawn so when spraying something, I usually cannot figure out where I have done so and where I have not and let me tell you it's as good as all the other reviews say it is! It was easy to mix, I used my Chapin 5 Gallon Lawn Spray and put about 1 once each gallon so I had 5 ounces of it. It was very easy to tell where I have or have not sprayed in the grass. It worked like a charm! The only thing is, one bottle of this will not last long and it is kind of expensive but it works just fine. If you found this helpful, consider leaving me feedback. And if you have any questions, feel free to ask, I'm happy to help.
A**R
Does the job well
The effect is very good!
J**N
Worth using
Mixed concentrated bush eradicator, water and this blueing in a 2 gallon sprayer. Wonderful! I can see exactly where I sprayed, I had a long fenceline and some other random spaced spors to spray. I could see where I sprayed and the eradicator worked just like it was supposed to. The blue eventually disappeared, so no worries if blueing gets on concrete.
S**S
Good product but expensive
I use this product for applying weed killer and prodiamine. It works well for marking the location where product has been applied via a sprayer. The recommended dose of 2 tbl per gallon works well for dormant grass. I needed to increase the doseage for areas that had green weeds as it blends into the green.
J**.
Excellent colorant for Lawn Spraying
This stuff is excellent at letting you know where you've already sprayed! Be careful, though, with using it in a backpack pump sprayer that leaks . . . I've gotten a couple of white T-shirts spotted-blue because of liquid leaking from the tank :-p Luckily, soaking the shirt in the sink w/ soap gets it all out . . . so, no long-term damage done. But, that isn't the product's fault . . . this stuff definitely tells you where you've been, and that you are actually atomizing your liquid (important when using a Dial-and-Spray hose-end sprayer).
K**R
ok
kinda expensive. we use it on a ranch, so need a lot of product. works good, however.
M**E
Great Value - Worked as Advertised
Since the beginning of this year, I took back the job of treating for pest, weeds and fertilizing my lawn. Until I came across How to With Doc I did not know of your products... They are are all as advertised, simply fantastic.. but you need to do a better job of keeping them in stock.
R**S
Very Very Blue - will buy more of this.
Pro: + Does exactly what it says it will do. + Use at 1oz per gallon to get a solid blue very noticeable marking Con: - none Add the colorant LAST when mixing - do not add first to tank otherwise you will have a colorful problem with any overflow. Rinse the tank with a hose under the seal before you start to use Blue is very noticeable in full daylight and sticks out vividly.