When a buyer of paprika or chilli asks for a colour value, they are not asking about appearance for its own sake. Colour is the closest thing the spice trade has to a single number that predicts how a material will perform in a finished product — and it is the number most often misunderstood by both sides of a contract.
What an ASTA colour value measures
ASTA colour is an extractable-colour measurement. A weighed sample is extracted in solvent, and the absorbance of the extract is read on a spectrophotometer. The result is reported as an ASTA colour unit. It is defined by a published method of the American Spice Trade Association, which is why the figure is comparable between laboratories — provided both are actually running the ASTA method.
Two things follow from that definition, and both matter commercially:
- It measures extractable carotenoid pigment, not visible redness. A material can look vivid and extract poorly, or look dull and extract well. Buying on a photograph is buying on the wrong variable.
- It says nothing about pungency. Heat is a separate measurement — Scoville units, or capsaicin content by HPLC. A high-colour paprika may be entirely mild. Specifying colour when you meant heat is a common and expensive error.
Why the value moves
Colour is not a fixed property of a variety. It is the outcome of a chain of decisions, and each link can cost or preserve pigment:
- Variety and maturity at harvest. Pigment accumulates as the fruit ripens. Early picking protects yield and costs colour.
- Drying. Excess heat degrades carotenoids. Drying that is too slow invites microbial growth. The two constraints pull against each other, and the drying regime is where much of the final colour is won or lost.
- Grinding. Milling generates heat and exposes pigment to oxygen. A finer grind, all else equal, tends to lose more colour.
- Storage and transport. Carotenoids degrade with time, temperature, oxygen and light. This is the critical point for importers: the value is not stable.
The clause most contracts get wrong
Because colour degrades, a colour specification without a time and place of measurement is unenforceable in practice. "Minimum 120 ASTA" is not a complete term. The complete term states the value, the point of measurement, and the tolerance.
Sensible contracts state something equivalent to: the value is determined on a sample drawn at loading, by a named laboratory, using the ASTA method, with an agreed tolerance and an agreed remedy if the result falls short. Buyers who need a guaranteed value at discharge should say so explicitly, and expect the offer price to reflect the risk the exporter is being asked to carry across the voyage.
How to read a certificate of analysis
When a colour figure arrives on a certificate, check four things before you rely on it:
- The method. Does the certificate name the ASTA method, or simply report "colour"?
- The date of analysis and the date of the lot. A value measured months earlier describes a different material.
- The sampling basis. Was the sample drawn across the lot, or submitted by the seller?
- The laboratory. Accredited third-party, or in-house? Both are legitimate; they carry different evidential weight.
What this means for Egyptian paprika and chilli
Egypt's growing conditions — a long, dry, high-radiation season — allow fruit to be brought to full maturity in the field and dried without the weather interruptions that force compromise elsewhere. That is a structural advantage for colour, but it is an advantage in potential. It is realised or lost in drying, handling and storage, which is why processing discipline matters more than origin marketing.
For our paprika and chilli, the colour value is reported per lot on the certificate of analysis rather than promised in advance as a fixed figure, because a fixed figure quoted before a crop is harvested is a marketing number, not a technical one. If your formulation requires a specific minimum, tell us the value and the point of measurement you need, and we will tell you whether we can contract to it.
Practical guidance for buyers
- Specify colour and pungency separately if both matter to you.
- State the point of measurement in the contract — loading or discharge.
- Ask for the method name on the certificate, not just the number.
- Store received material cool, dark and sealed; colour loss in your own warehouse is your loss.
- Where colour is critical to a finished product, retain a sealed reference sample from every lot.
Related reading: quality testing methods for imported herbs and spices. To discuss a specification, contact our export team.