Without color; lacking characteristics which give variety. blank (Adjective). Free from writing, printing, or marks; having an empty space to be filled in; as, blank paper; a blank check; a blank ballot. blank (Adjective). Without expression.
Yes they do damage hair. Every time I have tried one ,I wound up looking like a Q-tip or my head looked like cotton. A perm will damage even more and look worse if you have been coloring your hair. There's chance of it looking okay if you don't color your hair.
Perms are the simple chemical process of changing the natural shape of the hair follicle. Yes, chemicals applied to the hair actually breaks the natural textural code and then reforms the hair so that the texture is different. A hair perm can be achieved through either a cold or hot chemical process.