Ugh, coloring hair is such a messy and annoying procedure. I feel for you, I really do. My hair grows so darned fast, I have to touch up the roots every 3 weeks.
Be careful with washing too much. It strips your scalp of natural oils which protect it. This might make your head itch after coloring even if you're not having an allergic reaction.
And darned that red color....fades so quick, doesn't it?
Take care you gorgeous creature you...
gg