What Matcha’s Green Colour Can—and Cannot—Indicate

Colour is often the first matcha attribute compared in procurement. Powder is spread on a white surface, a photograph is taken and the greener sample moves to the top of the shortlist. The observation has value, but only within a defined context. Without identifying the sample form, light source, background, powder depth and application matrix, green colour can move from a useful signal to an unsupported conclusion.

The first question is not simply which sample looks greener. It is which stage is being evaluated: dry powder, a controlled water dispersion, or the finished product after milk, sugar, fat, flour, cocoa, fruit and processing have changed its appearance. These three forms of the product answer different commercial questions.

Powder Colour Is Evidence, Not a Quality Certificate

Chlorophylls and their derivatives contribute to the appearance of matcha, while shading, leaf material and processing can influence pigment composition. Research on tencha drying also reports changes in colour characteristics and chlorophyll derivatives within the particular materials and drying programmes studied. This confirms that appearance can contain information about raw material and processing; it does not turn visible greenness into a complete quality grade.

A study comparing matcha made from four tea varieties provides a useful caution. Pigment composition, dry-powder colour and prepared-tea colour did not move as a single simple indicator across those experimental samples. Chlorophyll, carotenoids and measured colour coordinates formed a more complex relationship. The result belongs to that sample set, but it demonstrates why one pigment value or one visual impression cannot summarise the product.

Green colour alone cannot establish price, flavour, umami, organic status, origin, harvest period or lot compliance. Organic status requires the relevant certification and scope. Origin requires traceable evidence. Flavour requires sensory and application testing. Price also reflects the agreed specification, pack format, supply arrangement and market conditions. A photograph cannot close those evidence gaps.

Evaluate Powder, Water Dispersion and Finished Product Separately

Dry-powder appearance reflects light from a prepared powder surface. Sample depth, particle arrangement, surface texture and clumping can all influence what is seen. Once the powder enters water, dispersion, settling, foam, liquid depth and the vessel change the appearance. The colour of a bowl or beaker is not a magnified version of the dry-powder measurement.

The finished formulation creates another visual system. Dairy and plant bases add their own colour and opacity. Sugar and fat change structure. Cocoa and fruit contribute dominant tones. Baking adds surface and internal browning. A study of gluten-free matcha muffins, for example, reported different colour responses in raw batter, the baked surface and the crumb within its specific formula. It does not establish a rule for all bakery products, but it shows why a powder photograph cannot predict finished-product appearance on shelf.

A buyer and R&D team can compare three forms of the product:

• dry powder, for raw-material appearance and visible uniformity;
• a controlled water dispersion, for a repeatable comparison of the basic dispersed colour;
• the finished product, for the colour created by the actual base, process, package and observation time.

The results may support one another, but one form should not substitute for another. The stage being evaluated should match the commercial question being asked.

Storage Observations Must Name the Material

A published matcha storage study measured colour changes in powder under the temperatures and time points used in that experiment. It supports controlled storage and timed checks for raw-material comparison, not shelf-life claims for bottled drinks, biscuits, chocolate or ice cream.

A darker-looking lot or shipment should not immediately be attributed to one cause. Sampling time, pack-opening history, moisture exposure, clumping, powder depth, lighting and camera processing can all create or amplify a visible difference. Quality should check lot identity, pack condition, retained samples and a controlled side-by-side comparison before assigning responsibility.

Raw-material storage and finished-product shelf-life work also remain separate. A colour result for powder in its supply pack cannot validate colour stability after homogenisation, baking, freezing, filling or commercial storage. Each application needs its own material, process and package evidence.

Standardise Viewing Conditions Before Interpreting Differences

CIE colourimetry guidance covers standard colorimetric observers and illuminants, reference standards, illuminating and viewing conditions, colour spaces and colour differences. The framework makes the central point clear: colour measurement is meaningful only when the measurement and viewing conditions are defined.

Research reviewing computer vision for food colour measurement likewise describes the importance of illumination, camera system, calibration and colour processing. A phone may alter white balance, exposure, contrast or saturation automatically, while social and messaging platforms may compress or process the image. Dark and white backgrounds can also change perceived contrast.

For controlled project photography, quality should keep the light source, background, vessel, sample quantity, powder depth, camera, position, exposure and white balance consistent. Original, unfiltered files should be retained with the sample and lot details. These controls make photographs more useful for internal comparison without making a phone image equivalent to an instrument reading.

Instrumental measurements require the same discipline. L*, a* and b* values have limited meaning without the sample form, illuminant, observer, geometry or aperture, preparation and replication method. Instrumental measurement can improve repeatability, but it cannot determine whether the flavour is suitable, whether the colour fits a brand brief or whether the powder will remain appropriate after entering a target formula.

Build an Application-Specific Colour Window

“Green” becomes commercially useful when it is converted into a defined application target. The target may describe the dry powder, a controlled water reference and the final product under a specified base, process, package and observation point. A latte, chocolate, muffin and bottled drink have no technical reason to share one universal green threshold.

Procurement can identify obvious appearance differences under controlled conditions, then ask R&D to test the shortlist in the real formulation. The final decision should combine colour results with sensory performance, process observations, instrumental data where relevant, and the agreed commercial specification.

If a project requires a colour window, an internally approved reference that has already passed application testing provides a more defensible starting point than an isolated photograph or a value copied from a paper. Quality should document the reference identity, preparation, measurement method and acceptable variation. A new formula, process or package may require a new window.

Colour is therefore useful as a communication and comparison tool, not as a substitute for flavour, process fit, compliance or cost evaluation. The strongest evidence states what was observed, under which conditions and for which product decision.

Discussing Colour Targets with CHA STELLA

CHA STELLA can discuss candidate matcha samples against the target colour profile in dry powder, a controlled water comparison and the actual formulation. Base ingredients, process, package and target sensory profile help define the relevant comparison. Final selection remains subject to project trials, an agreed specification and lot confirmation under the planned commercial conditions.