Got old faded mulch and don't want to add more bulk to your flowerbeds? Revitalize the old mulch with mulch dye (aka, mulch stain). I've used Colorback liquid mulch colorant for years to freshen up faded, wood mulch and it works great! It's easy to use too! Turn the mulch (or don't as long as it's dry), mix 4 ounces of Colorback colorant/stain with a gallon of water in a pump sprayer, and then spray the mulch. You only need to do one application for the flowerbeds to look nice; however, I turn the mulch and do a second application because the critters (squirrels, rabbits, and birds) like to stir things up. A half gallon container of Colorback will make 16 gallons of solution, which covers up to 6400 sq ft. While the dye isn’t as cheap as buying $2 bags of mulch (when it's on sale) at the big box stores, if your flower beds already have 2-3" of mulch, this is a great option. Before I found this product I would move the old mulch to the back of the flowerbeds (to reduce bulk) and then scatter new mulch on top of it... what a waste of time!
If you get the stain solution on masonry or building materials, wipe or spray with water before it dries. I've found it comes off easily.
Once mixed with water, you'll want to use the solution within 5 days, but the unmixed stain lasts for years. Just be sure to shake it well!
This video is NOT a paid promotion. I like Colorback because it is environmentally safe and has no odor. I'm sure there are other dyes on the market that will likely do the same thing.

For my full review of Colorback see this video:    • Colorback Liquid Mulch Colorant - REV...