To classify different types of saffron, the method of detaching the stigma from the style is usually considered. Saffron is divided into different categories. The higher the purity and quality of Saffron, the higher its coloring power and aroma. The grade of saffron depends on several factors such as the quality and size of the corm, the place of cultivation, and the method used to make it dry.
Negin saffron consists of three large & thick threads of red stigma completely separated, which, do not contain any part of the yellow style. The pieces of threads are smooth, stuck together, and free from frizz. Negin saffron is the most luxurious and expensive type of saffron and with a minimum of 220 units, it has the highest pigmentation power.
In this type, red stigmas completely separated from each other and fully detached from style make pure saffron. In addition to Sargol, Sargalam, Sarrisheh, and Mumtaz are also used for this type of Saffron. In sargol Saffron, the difference in quality causes a different coloring grade. The pigmentation spectrum of sargol saffron varies between 200 to 250 units.
In this kind of saffron, the three threads of red stigma were attached together along with 1 to 3 mm of the style part with yellow color. Depending on its quality, the coloring power of pushal saffron is from 180 units and above.
Super Nagin saffron, which is identified as the best type of saffron, is without any extra root (cream), its filaments are coarse and its tips are wide.
In addition, it is dried directly without bending and does not have wrinkles.