Caroline Hirons has unveiled what she calls Skin Rocks’ strongest exfoliating acid to date — and she’s warning her followers and fans that it’s definitely not designed for skincare beginners. We joined her at the launch of the new Skin Rocks The Strong Acid , where the skincare expert and brand founder described the formula as “barely legal” after pushing developers to make it “as strong as you can... but keep it legal”. Formulated using seven different acids, it's designed for experienced