Storage stability of biodiesel is the resistance offered by the
biodiesel to the chemical and physical changes taking place due to
the environmental factors and interaction during the long term
storage[73]. Storage stability pertains to the degradation of the
biodiesel and its interaction with the light, air, metal, moisture and
other conditions during storage. The visible effects of oxidation
during storage can be either deposit formation or the change in
color of the biodiesel. The color of the biodiesel also changes from
yellow to brown and starts smelling like that of paint[74,75]. The
factors responsible for storage instability are moisture or water,
particulate solids present in the sample, degradation products,
light, presence of metals and microbial slimes