(TrendHunter.com) YouTuber Ellie Thumann collaborated with Hally to create a limited-edition blue hair dye that's ammonia-free and infused with beneficial ingredients like moisturizing aloe and stimulating... (TrendHunter.com) YouTuber Ellie Thumann collaborated with Hally to create a limited-edition blue hair dye that's ammonia-free and infused with beneficial ingredients like moisturizing aloe and stimulating...