text: Source:
  When hemoglobin is exposed to certain conditions, reversible or irreversible hemichromes are formed.
  Reversible hemichrome formation occurs in the presence of:
  * Fatty acids
  * Aliphatic alcohol (n-butanol)
  * Dehydration
  * High concentration of glycerol
  * Polyethylene glycol
  Irreversible hemichrome formation occurs in the presence of:
  * Phenylhydrazine
  * Sodium dodecyl sulphate (SDS)