Endurant is not a grass paint that turns blue. Many grass paints on the market have an unnatural and/or blue tone. Endurant Turf Colorants do not turn blue. Users celebrate Endurant colorants for their particularly natural tones. Geoponics' brand of Endurant Turf colorants do not start out blue and will not fade to blue. Instead, Geoponics formulated Endurant colorants to match the most common turfgrass species. These organic pigments combine with nontoxic binder to last for a long time. And, when Endurant does fade, it fades on tone.
For more information on Endurant, including how long the natural looking will last, check out, the Q&A: How Long Does Endurant Turf Colorant Last?
Also, you may want help to get the best shade of green colorant for your grass type. If so, check out this Q&A: What Is the Best Shade of Endurant Based on Grass Species and Type? Any of the Endurant Turf Colorants can be used on any grass type. However, if you would like guidance to get the best possible match or to help find the look you most want, the above link will help you do just that.