DACH Matcha Goods-In Cause Isolation

Your plant buys one grade of Japanese matcha against one specification, and yet goods-in keeps producing the same three complaints: drums of the "same" grade that do not match each other in color, powder that cakes within days of the first bag being opened, and a Swiss subsidiary that rejects a pallet the German entity accepted without comment. The instinct is to re-tender the supplier. That instinct is often wrong, and it is always premature until the cause has been isolated.

This article is a cause-isolation protocol for arrival quality in DACH: how to tell supplier lot variance, EU-entry and inland transport exposure, and your own repack handling apart, using records you already hold. It is not a procurement or a compliance article. If your question is how to structure lots and consignment stock commercially before you order, read the DACH lot architecture and consignment split article. If it is residue specification and EU compliance paperwork, read the EU MRL and residue specification article. For GB readers weighing chilled against ambient third-party storage, there is a separate piece on the chilled versus ambient 3PL split.

Why re-tendering first usually moves the problem instead of solving it

Matcha is a fine, hygroscopic, oxidation-sensitive powder. Three independent systems act on it between the mill in Japan and your repack line, and each of them can produce symptoms that look identical in the goods-in report:

• The supplier's milling and blending lot. Leaf from different harvests, different blend ratios, a different mill date, a different throughput on the stone mill — all of these shift color and particle behavior.
• The EU-entry and inland leg. Sea arrival at a North Range port, a container that sits before devanning, a long unheated inland truck run, a bonded or ambient warehouse stage, repeated pallet handling.
• Your own plant. The moment the foil bag is opened, the powder meets your repack room's air. Headspace, reseal method, room humidity and the elapsed time between opening and repack all act within hours.

If you re-tender while all three are still in play, you change one variable out of three and keep the other two. In our handling experience — this is an observation from working with importers, not a measured study — buyers who switch supplier without isolating the cause tend to see the same complaint reappear within two or three inbound cycles, because the chain and the repack room came along unchanged.

The one thing you must have in place first: a retained reference

None of the checks below work without a stable comparison point. "Darker than usual" is not evidence. "Darker than the retained reference of this grade, under the same light, in the same dish" is.

Set the reference up like this:

• Keep a sealed retained sample of the grade you buy, in the same pack format you buy in bulk, stored frozen or at your coldest stable condition, opened only for comparison and then discarded rather than resealed.
• Record the reference's mill date and lot identifier from the supplier's documentation.
• Fix the viewing conditions: same room, same light source, same white tile or dish, same spoon quantity, same two people. Color judgments drift more with lighting than with the powder.
• Keep a second reference portion for aroma, opened in the same room at the same temperature as the sample under test.

Replace the reference on a stated cadence — once per contract year or whenever you accept a new base lot — and write the replacement date on the retention log so no one compares a new arrival against a two-year-old reference.

The three-way split sheet

One page per received bag or drum. Three blocks, filled in a fixed order. The order matters, because opening a bag permanently destroys the evidence in block one.

Block 1 — unopened state

Before any bag is opened, for each unit in the shipment:

• Outer carton and foil bag integrity; any pinholes, creases over seams, or abrasion from pallet movement.
• Bag firmness by hand. A nitrogen-flushed bag that has gone slack has either lost gas through the seal or was not flushed to the stated spec. Record firm / slack / vacuum-tight for every unit, not just the suspicious ones.
• Lot code, mill date and pack date exactly as printed. Group the shipment by lot code before doing anything else.
• Where the bag is translucent or has a window, or at the point of eventual opening: color against the retained reference, scored on a three-point scale (matches / slightly off / clearly off).

Block 2 — chain metadata you already hold

This is the block most plants skip, and it costs nothing to fill because the data is already in your files:

• Port of discharge and devanning date.
• Inland carrier and CMR number; date of the inland leg and any intermediate transfer.
• Any temperature log you received, and any gap in it. A gap is itself a finding.
• Known unrefrigerated dwell: hours on a yard, a weekend in an ambient warehouse, a customs hold.
• Pallet position and drum position within the pallet — outer layer, top tier, against the container wall. Heat and condensation exposure is not uniform inside a container or a truck.

Block 3 — post-opening state

• Date and time of opening, and elapsed days since goods-in.
• Ambient relative humidity and temperature in the repack room at the moment of opening, read from an instrument, not assumed.
• Headspace left in the bag after the first draw, and whether the bag was reflushed or simply folded and clipped.
• Reseal method and the interval to the next opening.
• Color and aroma against the reference at opening, then again at the next opening.
• A simple particle check: sieve a fixed mass through a fine mesh for a fixed time and record the residue mass. Soft lumps that break under light pressure are moisture pickup; hard, gritty residue is a milling or sieving characteristic. You do not need instrumentation for this, only consistency.

Reading the pattern

With one receiving cycle of sheets in front of you, the attribution follows from where the differences cluster:

• Differences between unopened bags from the same shipment, tracking the lot code. Cause: supplier milling or blending. The chain treated every bag identically, so the chain cannot explain a split that follows the lot code.
• Differences tracking drum position, discharge port, inland transfer date or a dwell event — within a single lot code. Cause: the EU-entry and inland leg. The classic signature is outer-layer and top-tier units that differ from protected units of the same lot, or a sub-batch that moved on a different CMR.
• Bags that match the reference when opened and drift only afterward. Cause: in-plant. Headspace, repack room humidity and reseal practice. The tell is that the drift correlates with days since opening rather than with anything upstream.
• The Swiss-rejects-what-Germany-accepted case. Before treating this as a product issue, check whether the two sites are comparing against the same retained reference, under the same light, with the same scoring scale, and whether the Swiss consignment moved on a separate inland leg after the German site took delivery. In our experience this split is more often a reference and transfer-leg difference than a lot difference — but the sheet is what tells you, not the assumption.

Mixed patterns happen. When they do, the useful discipline is to resolve in order: eliminate the in-plant block first because it is cheapest to fix and fastest to confirm, then the chain block, and only then open a conversation about the lot.

The three questions to send the supplier — and when

Send these only once block one points at the lot. Vague complaints produce vague answers; these three are answerable from records the producer keeps anyway:

1. The lot and blend record for the lot codes in question. Which base lots went into the blend and in what ratio, and whether the ratio changed between the lots you received.
2. The mill date and the interval from mill to pack. Two bags with the same lot code but different mill dates are not the same product for your purposes.
3. The nitrogen flush and sealing specification actually applied to your pack format. Residual oxygen target, seal width, and whether the specification is identical across 1 kg foil bags and larger cartons. Ask whether it is verified per batch or per production run.

If the cause sits in the chain, the equivalent questions go to your forwarder and 3PL: devanning time, dwell records, and whether the inland leg was temperature-controlled on the specific CMR involved. If the cause is in-plant, nothing needs to leave the building — you are looking at repack room humidity, bag sizing against your draw rate, and whether a smaller pack format would remove the headspace problem entirely.

What to do with the result

A completed cycle of split sheets changes the conversation in three ways. With the supplier, you move from "quality is inconsistent" to a named lot, a named question and an expected record. With your forwarder, you have a position within a pallet and a date, not a feeling. Internally, you can finally defend or reject the proposal to re-tender, because you know what share of the complaints the supplier could actually have caused.

It also tells you something about pack format. If the in-plant block keeps lighting up, the answer is rarely a different supplier and often a different bulk unit size matched to how fast your line actually consumes an opened bag.

Setting up the reference

The protocol stands or falls on the retained reference, and a reference has to be the grade you actually buy, in the pack format you actually buy, sealed to a stated specification. If you do not have one in place before your next inbound shipment, the next cycle produces impressions rather than evidence.

Request samples of the grade in the bulk pack format you buy, with the mill date, lot identifier and sealing specification stated, so you can set the reference and run the split sheet on your next arrival.