Saffron agents. It must, therefore, be stored away in air-tight containers to minimise contact with atmospheric oxygen. Saffron is somewhat more resistant to heat. Saffron is not all of the same quality and strength. Strength is related to several factors including the amount of style picked along with the red stigma. Age of the saffron is also a factor. More style included means the saffron is less strong gram for gram, because the colour and flavour are concentrated in the red stigmas. Saffron from Iran, Spain and Kashmir is classified into various grades according to the relative amounts of red stigma
Saffron (use) usual substitutes in food—turmeric and safflower, among others—yield a garishly bright yellow that could hardly be confused with that of saffron. Saffron's main colourant is the flavonoid crocin; it has been discovered in the less tediously harvested—and hence less costly—gardenia fruit. Research in China is ongoing. In Europe saffron threads were a key component of an aromatic oil known as "crocinum", which comprised such motley ingredients as alkanet, dragon's blood (for colour), and wine (again for colour). "Crocinum" was applied as a perfume to hair. Another preparation involved mixing saffron with wine to produce a viscous yellow spray; it was