Coloring hair..

Cora • Girl Mom | Irish Twins

I've read in several places that coloring hair is safe as long as you're in a well ventilated area and there's low ammonia. My natural hair color is dirty blonde and currently my hair is black/dark brown. I really want to color it again to touch it up. Plus cut it. I cut my own hair anyway. Is it safe? I've always been cautious while coloring my hair. I've been doing it since I was 12 and I'm 22 now. I know what I'm doing, if anything. Feedback is welcome 💕