It's in smoothies, toothpaste and pizza – is charcoal the new black?

The latest food and beauty fad doesn’t just look good on Instagram, it comes with dubious health claims too. Is it just a gimmick to absorb maximum cash from gullible consumers?There are two kinds of food that exist solely to be Instagrammed. There’s the gregarious type, prefixed by “unicorn”, striped through with bright colours and dusted with glitter. And then there is its surly cousin, which exists in simple, stark monochrome. Over the last few years, the trend for bla