Answer:
Long and thin red within with a nail at the end.
I can wave my hands at you but I never say goodbye. You are always cool when with me even more so when I am high!
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
First you see me in the grass dressed in yellow gay; next I am in dainty white, then I fly away. What am I?
Late afternoons I often bathe. I'll soak in water piping hot. My essence goes through. My see through clothes. Used up am I - I've gone to pot.
Brings the sky a lot closer.