Assuming you're talking about marking the shell in case it gets lost. The safest thing to do - would be to have the tortoise micro-chipped. That way, if it does get lost, it's simply a case of the finder taking the reptile to a vet - or calling animal control. Both of those organisations have scanners able to read the microchip - and will be able to contact the legitimate owner.
Yes Turtles do have an exoskeleton, it is called a shell. Without the shell the turtle would just be soft and in danger. :)
Why would you want to paint a turtle's shell anyway - unless it's for identification. A more sensible procedure would be micro-chipping ! It's permanent and doesn't wash off ! Anyway - to answer the question - so long as you use lead-free & solvent-free paint it shouldn't harm the turtle.
yes turtles do have a bottom shell
Yes Turtles do have an exoskeleton, it is called a shell. Without the shell the turtle would just be soft and in danger. :)
well you cant do that for them they half to do it on there own
no, nail polish has chemicals that can be fatal to it ,that would not be a good and safe idea.
Their shells appear to be painted, but it is accutually just the pigment in the shell that makes the paint like color.
Turtle cells. See "genetics". If you mean prior to turtles, it was a reptile without a shell, or just a tiny one.
A terrapin has a shell because it is a turtle, of course. There are 4kinds of turtles: aquatic turtles, land turtles, terrapins, and sea turtles. All turtles have shells.
Star Turtles are turtles with star like shell
A sea turtles shell stays on its back because its attached
A turtles shell is a form of armor; it makes it very hard for a predator to bite the turtle.