Patrick from Princeton Junction writes
In theory, Turf Mark Blue Spray Indicator Dye would have an indefinite shelf life since it does not contain any active ingredients. However, you shouldn't store it in any location where it is exposed to the sun as the UV rays would impact it in the jug the same way they do on the lawn to help break down the color. It's also possible the saturation could diminish over time and you may need to use more the longer you have it to achieve the same level of color when spraying.
Answer last updated on: 03/25/2021
