In open sun drying, there is a considerable loss due to various reasons such as rodents,
birds, insects and micro-organisms. The unexpected rain or storm further worsens the
situation. Further, over drying, insufficient drying, contamination by foreign material like
dust dirt, insects, and micro-organism as well discolouring by UV radiation are
characteristic for open sun drying. In general, open sun drying does not fulfill the
international quality standards and therefore it cannot be sold in the international market
(Sharma et al., 2009).