Pushal: this type of saffron contains filaments which have close 3mm style.
Sargol: this type is totally red, filaments are thinner than negin type and because of this type is result of sorting pushal, there are some broken filaments in this type.
Negin: all red, along thicker and longer filaments. in comparison to sargol, negin has more volume.
How to keep saffron Types:
Keep saffron in a dark place away from light. Put it in airtight containers for long time durability.