How to Spot Fake Spices: Purity, Adulteration and What to Check Before You Buy

Spices are one of the most adulterated food categories in the world. Not because the industry is unusually crooked, but because the maths is irresistible: they're high-value by weight, they're sold as powder, and almost nobody can tell the difference by looking. A bag of ground turmeric bulked out with 20% rice flour looks identical to the real thing.

This isn't a scare piece — the overwhelming majority of spice sold in New Zealand is exactly what it says it is. But knowing what to look for makes you a much better buyer, and some of these checks take ten seconds at your kitchen bench.

The five ways spices get compromised

  • Bulking. Cheap filler blended into ground spice — rice flour, corn starch, chalk, sawdust, spent husk. Invisible in powder, and it dilutes everything you're paying for.
  • Colouring. Faded or low-grade spice dyed to look premium. Turmeric, chilli and paprika are the usual targets because customers judge them almost entirely on colour.
  • Substitution. A cheaper plant sold as a dearer one. Cassia sold as Ceylon cinnamon. Safflower sold as saffron. Papaya seeds mixed into peppercorns.
  • Exhausted spice. The sneakiest one. Spice that's had its essential oils commercially extracted, then dried and sold as whole or ground. It looks perfect. It just doesn't taste of anything.
  • Mislabelling. No filler, no dye — just a claim that isn't true. Wrong origin, wrong species, or "organic" without certification behind it.

The spices most worth checking

Saffron — the most faked spice on earth

At its price per gram, of course it is. Common fakes are safflower petals, dyed corn silk, or shredded coconut fibre coloured red.

The cold water test: drop a few threads into cold water and wait. Real saffron releases its colour slowly, over several minutes, and the threads stay stubbornly red. Dyed imposters dump colour almost instantly and the thread itself turns pale or white. Real threads also flare into a small trumpet shape at one end — look closely.

The price sanity check: saffron takes roughly 150 flowers per gram, hand-picked. If a price looks like a bargain, it isn't saffron.

Turmeric — colour is the weak point

Because buyers equate bright yellow with quality, turmeric attracts both bulking and dyeing. There is also a well-documented history in some producing regions of lead chromate being used to intensify colour — a genuinely serious contaminant, which is exactly why sourcing and certification matter more here than with most spices.

The water test: stir a teaspoon into a glass of warm water and leave it. Pure turmeric settles into a soft layer and tints the water a gentle, cloudy yellow. Added dye tends to streak downward in vivid ribbons and colour the water intensely and immediately.

The feel test: rub a pinch between your fingers. It should feel fine and slightly silky. Grittiness suggests sand or brick dust; a chalky, soapy slip suggests talc or chalk.

Cinnamon — the substitution nobody hides

This one is so widespread it's barely treated as adulteration: most cinnamon sold globally is cassia, and plenty of it is simply labelled "cinnamon." That's legal in many markets, but if you're buying for the delicate flavour or the low coumarin content of true cinnamon, it matters enormously.

The quill test is instant and foolproof. A true Ceylon quill is tan, soft and rolled from many paper-thin layers — it crumbles between your fingers like a cigar. A cassia stick is dark, hard and a single thick hollow curl you'd struggle to snap. In powder, Ceylon is lighter brown and smells sweet rather than sharp.

We sell both and label them plainly — our Ceylon cinnamon guide explains when each is genuinely the better choice.

Black pepper

The classic filler is dried papaya seed — similar size, a fraction of the cost. The water test: tip whole peppercorns into a glass of water. Sound pepper is dense and mostly sinks; papaya seeds are lighter and tend to float. Look closely too — papaya seeds are more oval and shrivelled, and they smell faintly bitter rather than hot and piney.

Ground pepper hides far more, which is the best argument for buying whole and grinding as you go.

Chilli and paprika

Again a colour-driven category, historically targeted with industrial red dyes. The water test: sprinkle a little on the surface of a glass of water without stirring. Genuine ground chilli floats a moment then sinks slowly, colouring the water gradually. Artificial colour tends to bleed down in obvious coloured streaks straight away.

Note that colour alone tells you nothing about heat — Kashmiri chilli is deep red and mild, while cayenne is paler and much hotter. Anyone selling you colour as a proxy for quality is selling you the wrong thing.

Dried oregano and herbs

Independent testing in several countries has repeatedly found dried oregano cut with olive, myrtle or other cheap leaves. The check: crush a pinch between your palms and smell it. Real oregano is powerfully aromatic. Look at the fragments too — they should be reasonably uniform in colour and shape, not a mix of odd greens and unfamiliar leaf textures.

Cumin seeds

A known trick is grass seed dyed with charcoal to pass as cumin. The check: rub a small handful firmly between your palms. If your skin blackens, be suspicious. Real cumin leaves oil and aroma on your hands, not pigment.

Vanilla

The most common issue isn't adulteration so much as language. "Vanilla essence" or "vanilla flavouring" is usually synthetic vanillin — legal, clearly labelled, and vastly cheaper than the real thing. The gap between that and actual vanilla beans or powder is enormous in both cost and flavour. Read the word on the label, not the picture on the front. Our vanilla guide goes deeper.

The exhausted-spice problem

This one deserves its own mention because no home test catches it. Essential oils and oleoresins are commercially extracted from spices for use in food manufacturing and flavourings. What's left is physically intact — correct shape, roughly correct colour — but hollowed out. Dry it, grind it, and it passes every visual inspection you can do at a kitchen bench.

The only defence is your nose. Open the container and smell it before you're committed. Spice that's been through this smells faint and papery. Nothing about the appearance will warn you.

Six things to check before you buy

  1. Buy whole where you can. Whole seeds, pods, quills and peppercorns are far harder to fake and slower to fade. This is the single most effective habit.
  2. Look for a stated origin. "Product of Sri Lanka" or "grown in India" means someone is accountable for a supply chain. "Packed in…" with no origin at all tells you almost nothing.
  3. Check the species, not just the name. Especially with cinnamon (Cinnamomum verum vs cassia), where the common name covers two genuinely different products.
  4. Treat organic certification as a supply-chain audit, not just a farming method. It means the chain has been documented and inspected, which is itself meaningful.
  5. Be suspicious of bargains. Saffron, cardamom and vanilla have hard floors set by how they're grown and harvested. A price well under the market isn't a deal.
  6. Smell it early. The aroma when you first open it tells you more than any label. If it smells of little, it will taste of less.

Frequently asked questions

Are these home tests reliable?

They're useful indicators, not laboratory analysis. A pass doesn't guarantee purity and an odd result isn't proof of anything — water hardness, grind size and age all affect what you see. Treat them as a first look. If you have a genuine safety concern about a food product in New Zealand, the Ministry for Primary Industries is the right place to raise it.

Is adulteration a problem in New Zealand?

Imported food here is subject to food safety regulation, and the overwhelming majority of what's on sale is exactly what it claims to be. The risk sits mainly with long, opaque supply chains and with products where origin and species aren't clearly stated — which is why those two details are worth checking wherever you shop.

Does organic certification prevent adulteration?

It isn't designed as an anti-fraud measure, but it helps considerably, because certification requires the chain from grower to packer to be documented and audited. That traceability makes substitution much harder to hide.

Why does the same spice vary between batches?

Because it's an agricultural product. Harvest, weather, soil and drying conditions all shift colour and strength between crops. Mild natural variation is a sign of real food; suspiciously perfect uniformity in a natural product is worth a second thought.

Is ground spice always worse than whole?

Not inherently — freshly ground spice is excellent, and some things you'd never grind yourself. But ground spice hides adulteration better and loses aroma much faster, so it depends far more on how recently it was packed and by whom.

How can I tell if my spices are still good?

Smell them, then rub a pinch between your fingers to warm the oils and smell again. Faint, dusty or generic means past its best. Our guide to storing spices covers how to slow that down.

How we approach it

We import direct, pack in small batches in Auckland, and state origin on our products — Ceylon cinnamon from Sri Lanka, turmeric from India, and so on. We also sell both Ceylon and cassia cinnamon and label each one plainly for what it is, rather than calling everything "cinnamon," because the distinction is the entire point.

Browse certified organic spices, whole seeds and aromatics, or the full spice range.

Related guides

Back to blog