Spice Certificate of Analysis: How Importers Read an Indian Spice Lab Report (2026)
Short answer: a spice certificate of analysis (COA) is the lab report for one specific lot. To read it well, check four things in order: that the header ties the report to your lot, that every parameter in your specification is on it with a named method, that each result is in the right unit and below its limit with a limit of quantification that is low enough, and that the lab and the sample can be trusted.
This guide is for importers, retailers, private label brands and foodservice buyers who receive COAs with Indian spice shipments and want to know what each line means. It walks through a COA section by section, explains units, detection limits and "complies" statements, and lists the red flags that tell you to ask more questions before you accept a lot.
Who this is for: buyers of whole spices, ground spices and masala blends from India who need to approve lots for retail, foodservice or food manufacturing, and who want a COA to be evidence rather than paperwork.
In this guide
What a spice COA is, and what it is not
A certificate of analysis is a document that reports the measured results for a sample taken from one production or commercial lot. It is issued by the manufacturer's own quality laboratory, by an external testing lab, or by both, and it should travel with the lot it describes.
A COA tells you what a sample of that lot measured on the day it was tested. It does not tell you whether the lot is acceptable unless the results are compared against limits you agreed in advance. Those limits belong in your specification sheet.
COA, specification sheet and export certificates compared
Document | What it states | Who issues it | When |
|---|---|---|---|
Specification sheet | The limits every lot must meet | Agreed by buyer and manufacturer | Once, then version controlled |
Certificate of analysis | Measured results for one lot | Manufacturer lab or an external lab | With every commercial lot |
Export certificates | Origin, health or phytosanitary status of a shipment | Government or authorised bodies, as your market requires | With the shipment |
If you have not yet written the limits down, start with our spice blend specification sheet template. Most COA disputes trace back to a missing or vague specification rather than a bad lab.
Key point: read every COA side by side with your specification. A COA with no agreed limits behind it is a description, not an approval.
The anatomy of a spice COA: an annotated layout
Layouts differ between labs, but almost every spice COA has the same building blocks. Use this annotated layout to find your way around any report.
Section | What you will see | What to check |
|---|---|---|
Header | Lab name, report number, issue date, page numbering | Report number is unique and every page is present |
Sample details | Product, lot or batch number, quantity, sampling date and who sampled | Lot number matches your invoice, packing list and pack codes |
Test dates | Date received, date tested, date reported | Testing happened after production and before shipment |
Physical and chemical | Moisture, ash, volatile oil, markers such as curcumin | Each line has a result, unit, method and your limit |
Microbiology | Total plate count, yeasts and moulds, coliforms, E. coli, Salmonella | Panel matches your spec and the units are per gram or per stated weight |
Contaminants | Aflatoxins, ochratoxin A, pesticide residues, heavy metals, fumigants, colours | Scope is listed, units are clear and LOQ is below your limit |
Conclusion | Complies, does not comply, or results only | Conclusion is against your spec, not a generic standard |
Authorisation | Signatory name, role, signature or digital verification | You can confirm the report with the lab |
Step 1: check the header ties the report to your lot
Before you read a single result, confirm the report is about the material you are buying. This takes two minutes and catches the most common problem: a genuine report attached to the wrong lot.
Lot and product identity
Product name and grade match your purchase order, including the form: whole, crushed or ground, and any mesh size.
Lot or batch number matches the invoice, packing list and the codes printed on the bags or cartons.
Quantity or lot size is stated, so you know how much material the result represents.
Dates and sampling
Check the production date, sampling date and test date run in a sensible order. Then check who drew the sample. A sample drawn by the supplier and sent to a lab is common and acceptable for routine lots, but the report should say so, because the lab can only speak for the sample it received.
The laboratory
Look for the lab's accreditation and its scope. Internationally, testing labs are accredited against ISO/IEC 17025; in India, NABL is the national accreditation body for testing laboratories, and the Spices Board of India also runs quality evaluation laboratories. Accreditation covers specific tests, so check that the tests on your report fall within the lab's accredited scope.
Step 2: read the physical and chemical results
These parameters tell you whether the spice is what it claims to be, whether it has been diluted, and how it will behave in storage and in your product.
Parameter | What it tells you | Common method references |
|---|---|---|
Moisture | Stability, caking and microbial risk; also affects weight | ISO 939 |
Total ash | Mineral content; high values can signal soil, sand or filler | ISO 928 |
Acid insoluble ash | Sand and silica in particular | ISO 930 |
Volatile oil | Aroma strength and freshness | ISO 6571 |
Extraneous matter | Stones, stems, husk and other foreign material | ISO 927 |
Particle size | Grind consistency for ground spices and blends | Percentage passing an agreed sieve |
Spice specific markers
Many spices have a marker that matters more than any general parameter. For turmeric it is usually curcumin; for chilli it is colour, often expressed as ASTA extractable colour, and heat, measured as capsaicinoids by HPLC; for black pepper it is piperine, with ISO 5564 as one method. If a marker drives your price or your brand, it should be on every COA.
As is versus dry basis
Some results are reported on an "as is" basis and others on a dry basis, which removes the moisture from the calculation. A dry basis figure reads higher than the same sample as is. Check which basis your specification uses and make sure the COA uses the same one.
Key point: for physical and chemical results, the method matters as much as the number. Two valid methods can give different results for the same sample, so the spec and the COA should name the same one.
Step 3: read the microbiology results
Spices are agricultural products dried in the open in many regions, so microbiology is one of the most important sections for buyers whose customers will not cook the product, such as sprinkles, seasonings and ready to eat foods.
What a typical panel covers
Total plate count (also called aerobic plate count): the general microbial load.
Yeasts and moulds: a sign of moisture problems during drying or storage.
Coliforms or Enterobacteriaceae: hygiene indicators.
E. coli: an indicator of faecal contamination.
Salmonella: a pathogen, normally reported as detected or not detected in a stated sample weight, for example per 25 g.
How to read the numbers
Counts are reported in colony forming units per gram (CFU/g), often in scientific notation such as 1.0 x 10⁴. A result written as "less than" a value means the count was below what the method could count at that dilution. For Salmonella, check the sample weight tested, not just the word "absent".
If your specification requires a steam treated spice, the COA should be for the treated lot, after treatment. A microbiology result from before treatment tells you little about what you will receive.
Step 4: read the contaminant results
Contaminant results are where shipments are most often held at the destination, so this is the section to read most carefully. Your destination market sets the legal limits; your brand and your customers can set stricter ones.
Contaminant | What to look for on the COA | Where limits come from |
|---|---|---|
Pesticide residues | Number of compounds screened, any compounds detected and their levels | Destination rules, for example Regulation (EC) 396/2005 in the EU |
Aflatoxins | Aflatoxin B1 and total aflatoxins, reported separately | Destination rules, for example Regulation (EU) 2023/915 in the EU |
Ochratoxin A | Result for spices where it is relevant, such as chilli | Destination rules |
Heavy metals | Lead, cadmium and others your market sets | Destination rules and customer standards |
Ethylene oxide | Result and how it is calculated | Destination rules; the EU reports it as a sum that includes its breakdown product |
Unauthorised colours | Screen for Sudan dyes and similar | Destination rules and brand policy |
Pesticide screens
A pesticide result line that just says "complies" or "within limits" is not enough. Ask for the list of compounds in the screen, the LOQ for each, and the reference limits used. A screen that covers only a handful of compounds can pass while missing the residues your market checks.
Destination specific controls
Some markets apply extra checks to particular products from particular origins. The EU, for example, applies increased official controls to some foods from some countries under Regulation (EU) 2019/1793, and that list is updated regularly. In the United States, importers covered by FDA's Foreign Supplier Verification Program are responsible for verifying their suppliers; a COA is one piece of evidence in that process, not a substitute for it. For a wider view, see what global buyers actually check before sourcing from India.
Units, LOQ and "not detected" explained
Many misreadings come from units and detection limits rather than from the results themselves.
Term | Meaning | What to check |
|---|---|---|
% w/w or g/100 g | Percentage by weight | Used for moisture, ash and many markers |
ml/100 g | Volume of oil per 100 g | Used for volatile oil |
mg/kg (ppm) | Milligrams per kilogram | Used for heavy metals and some residues |
µg/kg (ppb) | Micrograms per kilogram, a thousand times smaller than mg/kg | Used for aflatoxins, ochratoxin A and many residues |
LOD | Limit of detection: the lowest level the method can detect | Shown on better reports |
LOQ | Limit of quantification: the lowest level the method can measure reliably | Must be below your limit |
ND or less than LOQ | Not detected, or below what the method can measure | Means not found at that LOQ, not zero |
Why the LOQ matters
"Not detected" is only meaningful if the method could have detected the substance at the level that matters. If the LOQ is higher than your limit, a "not detected" result does not prove compliance. Ask the lab or the supplier to retest with a more sensitive method.
Measurement uncertainty
Every result carries some uncertainty. Accredited labs can usually state it on request. When a result sits very close to a limit, the uncertainty tells you whether a retest at another lab could reasonably land on the other side of it. Agree in your specification how results near a limit will be handled.
Key point: a mix up between mg/kg and µg/kg is a factor of one thousand. Check the unit on every contaminant line before you compare it with a limit.
Red flags that mean you should ask more questions
None of these proves a problem on its own. Each is a reason to ask for clarification before you accept the lot.
Red flag | Why it matters | What to ask for |
|---|---|---|
No lot number, or a lot number that does not match your documents | The report may describe other material | A COA for your exact lot |
Test date before production or after shipment | The sample cannot be from your lot as shipped | An explanation and the correct report |
Results identical across several lots | Real lots vary; identical numbers suggest copying | Raw results for each lot |
"Complies" with no figures | You cannot check it against your limits | Actual results, units and methods |
No methods named | Results cannot be compared between labs | Method for each parameter |
LOQ above your limit | "Not detected" does not prove compliance | A retest with a lower LOQ |
Lab not accredited for the test | The result carries less weight | A report from a lab accredited for that scope |
Missing pages or no signatory | The report may be incomplete | The full signed report |
How to verify a COA before you accept a lot
A good COA is one layer of protection. The strongest buyers add two or three more, scaled to the size and risk of the order.
Confirm the report with the lab
Many labs can confirm a report by its number, and some reports carry a QR code or online verification. This is quick, and it protects you from altered or recycled documents.
Test independently at the right moments
Commission your own test on the first commercial lot, on any lot where the COA raises a question, and at an agreed frequency after that. For the sample to be fair, agree how it is drawn: representative sampling across the lot, not a single scoop from the top of one bag.
Keep retained samples
A retained sample from every lot, sealed and stored by both sides, lets you retest the same material if a customer complains. It turns a disagreement about results into a test anyone can repeat.
Trend the results
Put each COA into a simple sheet by parameter and lot. Trends show drift long before a single lot fails, and they make your next supplier review a conversation about data. If you buy custom blends, our custom masala manufacturing guide explains how golden samples and formula versions tie into this.
Buyer checklist
Use this every time a COA arrives with an Indian spice lot.
Match the product, grade, form and lot number on the COA to the invoice, packing list and pack codes.
Check that production, sampling, testing and reporting dates run in a sensible order before shipment.
Note who drew the sample and whether the lab is accredited for each test on the report.
Confirm every parameter in your specification appears on the COA with a result, unit and named method.
Check the reporting basis, as is or dry basis, matches your specification.
Read spice specific markers such as curcumin, colour, heat or piperine against your limits.
Check the microbiology panel matches your spec and that the Salmonella sample weight is stated.
Ask for the full compound list and LOQs behind any pesticide screen.
Check aflatoxin B1 and total aflatoxins are reported separately, with units in µg/kg.
Confirm every LOQ is below the limit it is being compared with.
Verify the report with the lab and file it with your retained sample record.
Add the results to your trend sheet and flag anything near a limit.
How Harvestia handles lab reports
Harvestia Group works with importers, retailers, distributors, food brands and foodservice buyers who need lab reports they can actually use. The way we work follows the order that protects quality:
Source: spices come through a clear supply chain from ground level farming families, with about 8,000 farming members across India helping maintain quality.
Quality control: incoming checks on raw spices, comparison against your approved sample, and lab reports / COA with commercial lots, reported against the parameters in your specification.
Pack under your brand: we process and supply, and we pack under the buyer's brand in the format you approve.
FOB Mundra: export lots are prepared for shipment FOB Mundra, with documents coordinated with your forwarder.
Tell us your destination and channel early, and we will agree with you which parameters, methods and limits go on the COA before the first lot ships. Samples are available from Rs 250 and pilot runs start from 50 kg, so you can review real lab results before you scale. For a full view of sourcing from India, see our spice exporter India sourcing guide.
Prefer email? Write to sales@harvestiagroup.com with the spices you need, your destination market, your channel and estimated volumes, and attach your current specification if you have one.
FAQs
What is a certificate of analysis for spices?
A certificate of analysis is a lab report showing the measured results for a sample from one specific spice lot. It usually covers physical and chemical parameters, microbiology and contaminants, and it should be read against the limits in your specification.
Is a COA the same as a specification sheet?
No. A specification sheet sets the limits every lot must meet; a COA reports the actual results for one lot. You need both, and the COA should report against the spec.
Who issues the COA for Indian spice exports?
It is usually issued by the manufacturer's quality lab, by an external testing lab, or both. Many buyers ask for an external lab report on key parameters such as contaminants, at least for the first lots.
What does "not detected" mean on a spice lab report?
It means the substance was not found at or above the method's limit of quantification. It is not the same as zero, so always check that the LOQ is below your limit.
What is the difference between mg/kg and µg/kg?
One mg/kg equals one thousand µg/kg. Aflatoxins and many residues are reported in µg/kg, so a unit mistake can change a result by a factor of one thousand.
Which parameters matter most on a spice COA?
For most buyers the deciding parameters are moisture, the spice specific marker, microbiology, aflatoxins, pesticide residues and any destination specific contaminant such as ethylene oxide. Which ones are critical depends on your market and use.
Should I accept a COA that only says "complies"?
Ask for the actual results first. "Complies" without figures, units, methods and the limits used cannot be checked against your specification.
How can I check a COA is genuine?
Confirm the report number with the issuing lab, check the lab's accreditation scope, and compare the lot number with your shipping documents. Independent testing of a retained sample gives you the strongest confirmation.
How often should I test independently?
Many buyers test the first commercial lot, any lot with a questionable COA, and then at an agreed frequency based on volume and risk. Write the frequency into your specification so both sides know what to expect.
Can Harvestia provide a COA with every lot?
Yes. Lab reports / COA come with commercial lots, and we agree the parameters, methods and limits with you before the first shipment, starting with samples from Rs 250 and pilot runs from 50 kg.
Need lab reports you can actually use?
Send us the spices you need, your destination market, your channel and your current specification. We will come back with questions, a sample plan and a quote.
Disclaimer: this article is commercial guidance only. It is not legal, customs or regulatory advice. Regulation and method references are examples; always confirm current requirements for your products and markets with the relevant authorities and your own advisers.
Harvestia Group, Ahmedabad, Gujarat, India | sales@harvestiagroup.com | www.harvestiagroup.com
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