Research performed by the University of Maryland noted that termites were found equally underneath mulched areas, rocked areas and uncovered ground areas.
The most common color pigments used in making dyed mulch are iron oxide (rust) and carbon. These are common elements present in the soil naturally and therefore cause no risks to landscape plants and trees.
No, once the dye is completely cured or dried it will not wash out during rain storms.
Freshly dyed mulch can temporally stain hardscape surfaces therefore special care including clean-up needs to be taken when mulching areas around sidewalks, patios or driveways. It is similar in regards to paint; there is no longer a concern of staining once cured or dried.
Natural hardwood that hasn’t been dyed with a color will typically begin to fade in 1 to 2 months depending on its exposure to the sun. However, when dyed it can retain its color up to 2 years.