Refresh Mulch without Replacing it!

Discussion on refreshing mulch without the time, labor, and money of replacement.
Items used:

Mulch dye
https://www.amazon.com/gp/aw/d/B00FZGYS2A?psc=1&ref=ppx_pop_mob_b_asin_image

Sprayer
https://www.amazon.com/gp/aw/d/B07L4Q3MVY?psc=1&ref=ppx_pop_mob_b_asin_image

Forgot to mention that the dye dries in 15 minutes and per package instructions is not harmful to humans, pets, or plants.