In 2011, in a certain township called Anderslov in Sweden, formerly blonde residents' hair mysteriously started turning green. Was it a biological problem? Was it a disease? Was it contagious? Nope... Actually, suspicion initially was towards the drinking water and in particular, the copper levels since copper is known to dye things green via a complex oxidation process. When copper oxidizes, it forms minerals that are green (and/or blue) including: brochantite (hydrated copper…