Saffron is the single most labor-intensive spice to produce.
So hard that many mass-produced saffrons are fake—either fortified with dyes or made of other substances. For the real deal, the International Organization for Standardization developed a “power of coloration scale.” Grade 1 saffron has a power coloration above 190 UPC, or units of power of coloration, while Matiz Azafrán regularly tests at over 240 UPC.