BIOBLEND Plant-Based Hair Dye and Care Shampoo (100mL)Finally. Grey Coverage That Doesn't Come With a Warning Label. "I'd put off dyeing my roots for weeks because the last box dye left my scalp red and sore for days. I tried BIOBLEND half expecting the same. No smell, no burning, no staining on my forehead just covered roots and softer hair than before I started. I actually enjoy it now." Grinne O'Connor, Kildare (47) Safe Enough to Apply With Your Bare Hands That is not a marketing line. It is a test.