Even all type 4 hair is different so it is hard to tell. I go by feel. It feels dry, for lack of better description. Rough, brittle. It should have some feeling of elasticity, like if you pull it (gently) it should stretch and not break. It does feel soft when it is moisturized, and maybe not shiny but not quite dull either. Light will still bounce from the surface.
I'm sure that was confusing, I hope that helps. You just have to get accustomed to how your own hair behaves when it is dry vs. when it is not.
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