Very irritating
Just because the mask is black does not mean that you'll get the detoxifying properties of charcoal.  I had to take it off after 5 minutes because it was burning and stinging my face.  I've tried the Creme Shop's Calm Down, Skin, Charcoal Lemonade Fusion, and Honey Lavender Fusion sheet masks and they have all had the same effect.  Their formulas must not agree with my skin type.  2 stars instead of 1 only because of it's temporary tightening/smoothing effect (despite the lasting tingling irritation).
Rating: 2 stars