Can a male turtle become a black turtle?

First of all, it has nothing to do with unchangeable ink. Moreover, when the male turtle matures, it will gradually become dark, so the male turtle of its young turtle will not become dark. This inking is also possible, just like human genes. After all, there is no accurate statement about this, so we can only investigate it from the turtle friends' grass turtles. In other words, not every mature male grass will change.