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.
which one is better ??
All types are original saffron, difference is between method of sorting saffron threads, coloring power (crocin) between Negin and Sargol is same approximately, however Negin is more, if we want to ranking saffron types, Negin is the best, and sargol , pushal are in the next levels respectively
How to keep saffron:
Keep saffron in a dark place away from light. Put it in airtight containers for long time durability.