Please see this section for more information. Why Do Magic Mushrooms Stain or Bruise Blue?In Psilocybin Mushrooms of the World, Stamets notes that blue-staining, or "bluing", in magic mushrooms best way to eat mushrooms magic is not well understood. However, the process is thought to parallel the degradation of psilocyn - the primary active chemical in most magic mushrooms. Therefore, bluing should be avoided (through careful handling) because it probably reduces a mushroom's potency. Dose and effects can vary considerably depending upon mushroom type, method of preparation, and tolerance of the individual. It can be difficult to determine the exact species of mushroom or how much hallucinogen each mushroom contains. Initial smaller doses and a longer period of time to determine the effects may be a safer option if you choose to use psilocybin for recreational purposes.