What are colored vs grey letter icons in NGL inbox?

so what is if you don't understand what's like gray letter icons on NGL so you have colored red icons and you have gray ones so gray ones means that you open the message so if you I have here red one let's tap it uh and then I go back and then it's gray so gray means I open it up and colored means it was unopened so there you have it also there is like a green tick in the top right meaning that you open it up and then you reply to it

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