what color is the sky

The sky isn't just blue, the sky is sky blue

red :p

some people also say it can sometimes be seen as green or even purple at some times

during a solar eclips it is completly black

Know what....that is true!!!  During sunset, the sky changes color.  If you see the northern lights, then the sky becomes green and purple and pink!

The sky can be many color like

grey

white

ssky blue

pink ( during sunset )

black

purple ( during sunset )

yellow and orange ( during sunset )

or during a northern lights show it can be black with pink, green, and purple