5 idioms

1)get/have gray hair
http://www.idiomconnection.com/color.html#A3
It is a hard work which make me get gray hair.
to have one's hair turn gray from stress.
2) in the pink(of condition)
http://www.idiomconnection.com/color.html#A3
She is in the pink, so she need not to see doctor.
in very good health
3)in black and white
http://www.idiomconnection.com/color.html#A3
I have written my paper in black and white
in writing, officially
4)white lie
http://www.idiomconnection.com/color.html#A3
I knew she said a white lie to avoid my feeling
a harmless or small lie told to be polite or to avoid hurting someone's feelings
5)blackout
http://www.idiomconnection.com/color.html#A3
He had had a blackout after the accident
a temporary situation where you do not release some information