The economics explain everything. Saffron sells by the gram, the raw material is three stigmas from a flower that blooms for a fortnight, and the finished product is a small pile of red threads that most people cannot tell apart. Wherever the value per kilogram is that high, the incentive to dilute it is proportionate.
What adulteration actually looks like
It ranges from crude to sophisticated. At one end, dyed safflower petals, maize silk or shredded fibre sold as saffron outright. In the middle, genuine saffron bulked with its own yellow styles, the part of the flower with little colour or aroma, or with excess floral waste. At the far end, real saffron treated with glycerine, honey or oil to add weight, or dosed with a colourant so a weak lot tests strong. The last category is the one that survives a visual inspection.
Three checks you can run on receipt
- The water test. Drop a few threads into a glass of room-temperature water. Genuine saffron releases a golden-yellow colour slowly, over several minutes, and the threads keep their red colour. Dyed material bleeds red or orange almost immediately and the threads themselves go pale as the colour leaves them.
- The rub test. Rub a thread firmly between finger and thumb. Genuine saffron is resilient and does not stain much. Material coated in dye transfers colour to your fingertips, and threads padded with oil or glycerine feel slightly greasy rather than dry and springy.
- Look at the shape. A true stigma is trumpet-shaped, flaring and serrated at one end. Safflower petals are flat and uniform, and dyed maize silk is a smooth, even filament with no flare. Under a hand lens the difference is obvious in seconds, and a hand lens costs less than a sample.
These three catch the crude end of the market, which is most of it. They do not catch a competently adulterated lot, which is why the next three exist.
Three that need a laboratory
- ISO 3632 spectrophotometry. The standard measures three absorbance values on a dry basis: crocin for colouring strength, picrocrocin for bitterness, and safranal for aroma. Colouring strength is the headline figure and the one that sets the grade, Category I at 190 and above, Category II at 150 and above, Category III at 100 and above. Ask for the full three-value report, not just the category, because a lot can sit at the very bottom of a band and still be sold as that band.
- Style and floral waste content. Yellow styles are the cheapest legitimate filler there is. All-red grades: Mongra and equivalent, are stigma tips only. Specify a maximum style content and a maximum floral waste, in percent, and have it verified rather than described.
- Moisture and volatile matter. The standard caps it because added weight is added water. A simple loss-on-drying result exposes threads that have been humidified, oiled or honeyed to bulk the shipment, and it is the check most likely to be skipped.
Buying practice that protects you
- Buy a small first lot and test it independently before committing to volume. With saffron this is inexpensive relative to the risk, which is unusual.
- Insist on a lot-specific ISO 3632 report from an accredited laboratory, dated after packing, naming the lot code on the tin.
- Keep a retained counter-sample yourself and require the supplier to keep one too. Disputes without a counter-sample are unresolvable.
- Require tamper-evident tins with the lot code printed on the tin itself, not only on the outer carton.
- Where geographical origin matters commercially, check that the protected-origin documentation covers the actual lot rather than the supplier in general.
None of this is unusual diligence. It is the normal standard of care for a product that costs more per kilogram than most of what your warehouse holds.
Aikyam handles saffron enquiries case by case, with ISO 3632 results per lot and a retained counter-sample as standard. Tell us your grade and volume.