The dye used on any of the critter items sold commercially that are intended to be chewed is going to be safe. Most commonly they use vegetable based food coloring. The worst that happens with some dye used is it runs when wet (peed on or water bottle drips), so it can stain (harmlessly) your chin temporarily.
As said with the lava ledges some chins chew though them quickly so they are more a chew toy then a functional permanent ledge. My guys like to leave the ledges alone for sometimes months, then decide one night they need to be demolished, lol. The triangle lava bites are a hit too, I use them in hanging toys.
You should check out the vendors on here, you can get all kinds of ledges, perches, sticks and toys for much cheaper then in a pet store. As an added bonus you can feel secure that they are all chin safe stuff as most sellers use what they sell for their own personal chins.