Economy of Iran spices including cumin and sumac. Iran is the world's largest producer of saffron, pistachios, honey, berberis and berries and the second largest date producer. Meat and dairy products include lamb, goat meat, beef, poultry, milk, eggs, butter, and cheese. Non-food products include wool, leather, and silk. Forestry products from the northern slopes of the Alborz Mountains are economically important. Tree-cutting is strictly controlled by the government, which also runs a reforestation program. Rivers drain into the Caspian Sea and are fished for salmon, carp, trout, pike, and sturgeon that produce caviar, of which Iran is the largest producer. Since the
Saffron colouring strength can range from lower than 80 (for all category IV saffron) up to 200 or greater (for category I). The world's finest samples (the selected, most red-maroon, tips of stigmas picked from the finest flowers) receive colouring strengths in excess of 250, making such saffron over three times more powerful than category IV saffron. Market prices for saffron types follow directly from these ISO categories. Sargol and coupé saffron would typically fall into ISO 3632 category I. Pushal and mancha would probably be assigned to category II. On many saffron packaging labels, neither the ISO 3632 category nor