Two guava lots can both be called pink and still behave like different raw materials. Flesh colour is useful on a delivery sheet, but it does not describe seed load, stone-cell texture, maturity, acidity or the product the line is meant to make. Building the material record first gives a pulping trial something real to compare.
Write the lot identity before the colour
Start with the information that stays attached to the fruit: cultivar or local name where known, growing origin, harvest or receipt date, flesh colour, fruit size range and the condition of the load. FAO's guava discussion notes that commercial cultivars range from red to white flesh, so a colour category is a starting descriptor rather than a complete variety specification. A white-fleshed lot from one district may carry a different seed burden from a pink lot in the next delivery.
Record how the fruit was handled before it reached the plant. Guava is delicate and sensitive to postharvest damage, and FAO notes that it can host fruit flies and other penetrating insects, making careful inspection part of receiving rather than a decorative step. Maturity grading by clean-water flotation is also described in the historical guava literature: immature fruit tend to sink while mature fruit float. If a site uses that approach, record the water condition and the actual lot result; do not treat one flotation outcome as a universal maturity grade.
Record seed load and the texture you can observe
Cut a representative sample and describe what the fruit contains. Note seed size, how firmly the seeds sit in the pulp, whether the sample shows damaged or broken seeds, and roughly how much firm material is present relative to soft flesh. The aim is not a laboratory number for its own sake; it is a consistent description that can be compared with the next delivery and with the pulper residue.
Keep gritty texture separate from seed content. FAO's guava section explains that stone cells produce a grainy texture and are distinct from the seeds. That distinction matters at receiving: a sample can feel gritty without containing a visible seed fragment, and a sample can contain a hard seed piece without describing the overall mouthfeel. Record where in the mouth the sensation appears, whether it is localized or widespread, and whether the sample was raw, heated or pulped. These observations help the trial team ask the right question instead of arguing about a single word.
Attach a method to aroma, solids and acidity
Aroma, soluble solids and acidity are useful only when the measurement conditions travel with the result. Record the sample temperature, the instrument or sensory method, the sample preparation and the date. A refractometer reading from one fruit is not a lot specification, and an acidity result without its method is difficult to compare with a supplier certificate. If the plant receives a certificate of analysis, keep it with the receiving record and identify which sample it represents.
Acidity deserves particular attention because it shapes the product boundary. FAO notes that more acid guava cultivars can produce fine nectar bases with added sugar, while the exact blend remains a product-development decision. A fruit lot intended for a formulated beverage base will therefore be assessed differently from a lot intended for a minimally diluted pulp. Record the target product on the same sheet as the material results, so the numbers are read in context.
Let the product target change what matters
Pulp, cloudy juice, clear juice, nectar base and a formulated beverage base are different endpoints. For a pulpy product, the receiving record should emphasise seed condition, stone-cell observations and the body the buyer wants. For a clear juice route, FAO describes pectic-enzyme treatment followed by centrifugation, and notes that much of the colour remains with the pulp residue. A pink-fleshed lot is therefore not automatically a pink clear juice; the process boundary changes what carries through.
This is also why a machine setting cannot be selected from a colour photograph. The pulper and refiner respond to feed condition, fruit preparation and the accepted product criterion. A lot with soft flesh, abundant small seeds or a high proportion of damaged fruit may need a different preparation discussion from a firm, sound lot. Write those differences down before the trial so the equipment comparison is made on material behaviour rather than on a cultivar name alone.
Carry the record into the trial, not just the file
A receiving record becomes useful when it follows the fruit into the trial. Give the trial a lot identifier and attach the cultivar, flesh colour, maturity observation, seed description and any measured solids or acidity. Note the preparation route, the screen fitted to the pulper, the operating condition and the samples taken from product and residue. When results differ, the team can then ask whether the cause was the lot, the preparation, the screen or the operating condition.
The record should also state what is still unknown. If the cultivar is only a local market name, say so. If maturity was assessed by appearance rather than by a measured method, say so. If no acidity result exists, leave it blank rather than filling the gap with an assumed value. A careful description of the material is a more useful start for a guava line than a confident label that hides the variation the trial is meant to investigate.
SOURCES AND SCOPE
Primary sources
- Produce Facts: GuavaUC Davis Postharvest Technology Center · accessed 2026
Commodity maturity and material-quality context. Used for the receiving record; no copied tables, photographs or cultivar-specific guarantees.
- FAO Agricultural Services Bulletin 146, Chapter 15: Tropical fruitsFood and Agriculture Organization of the United Nations · 2001
Section 15.4 on guava: flesh colour range, postharvest fragility, inspection, flotation grading, stone cells and the clear-juice route. Historical reference, not a current machine specification.
These sources support the qualitative context in this article. They do not validate a machine, a process schedule or a project result.