Crocin
Also written crocins, crocin (saffron), picrocrocin, safranal
Quick answer
The water-soluble pigment of saffron — the rare exception to the rule that spice colourants live in fat, and the reason saffron is steeped in liquid rather than fried.
What it does
Saffron works through three compounds acting on three different senses, which is unusual enough to be worth stating plainly. Crocin is the pigment and gives the intense yellow-orange; picrocrocin is the bitter compound and supplies the taste; safranal is the volatile that supplies the hay-and-honey aroma, and it is largely generated from picrocrocin during drying rather than being present in the fresh stigma. The international grading standard for saffron measures all three, which is why saffron is one of the few spices with an objective quality scale rather than a reputational one.
How it behaves when cooked
Four properties of the molecule, and what they mean at the stove.
- Volatility
- low
- Fat solubility
- low
- Water solubility
- high
- Heat stability
- moderate
Crocin is a carotenoid that has been made water-soluble by attached sugars, and that single structural difference reverses every rule that applies to paprika and turmeric. Saffron is steeped in warm water, milk or stock rather than bloomed in fat, because fat extracts it poorly and liquid extracts it almost completely. Warm rather than boiling liquid is correct: it is enough to dissolve the crocin and to release the picrocrocin, while boiling drives off the safranal and takes the aroma with it. The traditional twenty-minute steep before the saffron goes into the dish is not superstition — it is the time the extraction actually needs, and saffron threads thrown directly into a paella at the end give colour to the threads and not to the rice. Crushing the threads first, or grinding them with a little salt or sugar as an abrasive, meaningfully increases yield from an expensive ingredient.
Spices that carry it
Recorded on the compound rather than on each spice, so the two cannot disagree.
- SaffronPrincipal component
Not to be confused with
Compounds a reader is likely to take for this one, and why they differ.
Curcumin
Turmeric is the standard cheap adulterant and substitute for saffron, and the substitution fails on solubility before it fails on flavour: turmeric will not extract into the steeping liquid and saffron will not bloom in the fat. The colour is also wrong — flat yellow rather than orange-red.
Safflower
Sold as saffron in several markets and unrelated. Safflower florets dye a liquid yellow and contribute nothing else; the deception is old enough to be named in medieval adulteration statutes.
Regulatory position
Held on the compound, because the restriction is a fact about the molecule rather than about any one spice.
International
permittedISO 3632 (saffron specification and test methods)
The international standard grades saffron by spectrophotometric measurement of colouring strength, bitterness and aroma — crocin, picrocrocin and safranal respectively. It is the mechanism by which saffron grade claims can be checked rather than asserted, and it is why saffron is the spice where a stated grade means something.
Safety
What the concern is. The dose, the population and the evidence level live on the spice profiles, which is where a reader with that question actually arrives.
Culinary quantities of saffron are measured in threads and present no established concern. The reported adverse effects in the literature concern gram-scale doses far beyond any culinary use, which are also far beyond what anyone would pay for; the saffron profile records this with the exposure stated. The practical risk attached to saffron is not toxicological but commercial — it is among the most adulterated spices in trade.
Questions this page answers
- what is crocin
- what does crocin do
- what is crocins
- what is picrocrocin