If you have a collection of shampoo bottles lining your shower walls, or are simply looking for a more sustainable alternative, you might want to consider a shampoo bar. Instead of the liquid consistency you might be used to, shampoo bars are solid, concentrated shampoos made with natural ingredients and essential oils, says Brooke Jordan, hairstylist and co-founder of The Birdhouse, a salon in New York City. If you’re new to solid shampoo and looking to try it out, we spoke to experts about the... Read this story