Indian cumin is quoted at either 99 per cent or 99.5 per cent purity. The price gap between the two surprises buyers who read it as a rounding difference.
It is not a rounding difference. It is an extra machine pass, and it costs real money to produce. This page explains what that half a percentage point is made of, why the price moves so much, and what else belongs on a cumin contract.
What “purity” means in cumin
Purity here is a physical count. It is the percentage of the material that is clean cumin seed, by weight.
The rest is not dust. It is a mixture of:
- stalk and stem fragments left after threshing
- seeds of other plants picked up in the field
- small stones that survived gravity separation
- immature seed, which is lighter and thinner
- damaged or broken seed
At 99 per cent purity, one kilo in every hundred is this mixture. At 99.5 per cent, it is half a kilo.
Why the last half per cent costs so much
Cleaning cumin is a sequence of machines, and each one removes a different kind of problem.
Gravity separators use air and vibration to split heavy seed from light material. Sieves sort by size. Destoners pull out stones. Magnets take out metal fragments.
The last step is optical sorting, sometimes called sortex. A camera looks at every seed as it falls and a jet of air knocks out anything the wrong colour or shape.
Getting from 99 to 99.5 per cent means another full run through optical sorting. Two things happen when you do that.
First, you lose yield. The machine does not only remove defects. It also rejects some good seed that happens to look wrong. That loss is usually a few per cent.
Second, you use machine time and labour for a second pass on the same tonnage.
Both costs land in the price. So the gap you see is not the supplier taking advantage. It is the cost of the work.
Do you need 99.5 per cent?
Often, no.
If you are grinding the cumin, small amounts of stalk make very little difference to the finished powder, because the ash figures will catch anything serious.
If you are packing whole seed for retail, appearance matters more, and the higher grade is usually worth it. A consumer who finds a stone in a spice jar does not buy that brand again.
If you are extracting oil, purity matters less than volatile oil content.
Decide from the application. Our cumin seeds are supplied at both grades so the choice stays with you.
“Singapore quality” and “Europe quality” are not purity grades
This is the most common misunderstanding in the cumin trade, and it costs people containers.
Singapore quality and Europe quality are commercial descriptions. They bundle physical purity together with other requirements. In the European case, the most important of those other requirements is pesticide residue limits.
Read that again, because it is the point of this section. A lot can be 99.5 per cent pure by physical count and still fail an EU shipment on chemistry.
Physical purity is about what you can see. Residue compliance is about what you cannot. They are separate tests, separate risks and separate clauses in a contract.
Buyers who assume that the higher physical grade covers them on residues find out at the destination port, which is the worst place and the most expensive time.
EU residue limits explains how those limits work and why the default value catches so many people.
What else belongs on a cumin specification
Purity alone is not a specification. A workable one covers these:
- Purity percentage, with the counting method stated. Different labs count differently.
- Moisture, typically 9 per cent maximum. Cumin holds its oil better when it is dry.
- Total ash and acid insoluble ash. Acid insoluble ash is the real test for added sand or soil.
- Volatile oil, if you are grinding or extracting. This is where the aroma lives.
- Admixture, meaning seeds of other species, as a separate figure from general impurity.
- Residue panel, tested against your destination market’s limits.
- Microbiology, if your process needs it, and the treatment method if any.
A note on volatile oil
Cumin loses volatile oil quickly once it is ground. Whole seed holds it far longer.
If you are buying cumin powder, the grinding date matters as much as the origin. Ask for it. Material milled six months ago and stored is not the same product as material milled against your order.
Why Unjha matters
Unjha, in Gujarat, is the largest cumin market in the world. Most Indian cumin passes through it, and the prices set there effectively become the reference for the global trade.
This is not a marketing point. It has two practical consequences for a buyer.
First, the crop position is visible. You can see what has arrived, what quality it is, and where prices are moving. A supplier buying in Unjha knows those things. A supplier buying from a trader two steps away is guessing.
Second, material can be held against a forward contract rather than bought on the spot whenever an order lands. Cumin has one harvest a year, usually arriving from February. Prices move through the year as stocks run down.
If you have a known annual requirement, contracting a volume at harvest and calling it off through the year is usually cheaper and always more predictable than buying four times at whatever the week demands. Origin sourcing covers how that works.
Crop timing, briefly
Cumin is sown in winter and harvested from late February into March. New crop arrives in the markets shortly after.
Prices are usually lowest at peak arrival and rise as the year goes on. Quality is also at its best early, because storage costs the seed some of its oil.
If your buying schedule has any flexibility, align it with arrivals. If it does not, contract forward.
The short version
The difference between 99 and 99.5 per cent cumin is one more pass through optical sorting, plus the yield lost doing it. That is why it costs more.
Buy the grade your application needs. Do not assume a higher physical grade protects you on pesticide residues, because it does not. Those are separate requirements and both belong in your contract.
Add moisture, ash, volatile oil and a residue panel against your destination, and you have a specification a supplier can actually be held to.