Sorting and Cleaning
What Counts as a Bad Nut
Short answer: A bad nut is one with mould, rancid smell, insect holes, cracks that expose the kernel to damp, softness, shrivelling, or a hollow, light feel. Bad nuts are discarded, not mixed, washed, or eaten, and the definition should stay strict through every stage.
What does this step involve?
- Mould, rancid smell, holes: bad.
- Soft, shrivelled, hollow: bad.
- Strict definition, every stage.
What proves it worked?
Hold the definition strict at every stage: mould, rancid smell, insect holes, cracks that expose the kernel to damp, softness, shrivelling, or a hollow light feel all mean bad. Bad nuts are discarded, not mixed, washed, or eaten, and the definition must not soften just because a batch is small or a nut looks almost good. Strict bad-nut rules protect good batches, and soft rules protect nothing.
Mould, smell, and holes as clear signals
Mould is usually visible as fuzzy or discoloured patches, rancidity announces itself through a stale, paint like smell, and insect holes show as small round entry points that often come with fine dust nearby. Any one of these signals alone is enough to discard the nut, because none of them improves with time, washing, or trimming, and each of them can affect neighbours if the nut remains in the batch. Learning to recognise these three signals quickly is the foundation of sorting, and it is worth practising on known bad nuts so the signs become familiar before a large harvest arrives.
Soft, shrivelled, and hollow as quieter warnings
Not every bad nut announces itself loudly, because some are soft when squeezed gently, shrivelled inside a shell that looks normal, or hollow and light when weighed in the hand. These quieter faults still mean the kernel is poorly formed, deteriorated, or missing, and they deserve the same firm discard as the louder signals. A nut that feels wrong, even if it looks acceptable, should be opened for inspection if you are uncertain, and discarded if the kernel confirms the doubt, because feeling is often the first hint of a problem the eye has not yet caught.
Cracks that let damp inside
A cracked shell is not automatically a bad nut, but a crack that exposes the kernel to damp, dirt, or insects has already compromised the protection that the shell exists to provide. Inspect cracked nuts individually, checking the kernel for damp, mould, or damage, and discard any where the kernel has been exposed for long enough to deteriorate. Sound kernels from freshly cracked shells may still be usable promptly, but they should not be stored as if their shells were intact, because their protection is already gone.
Strictness when a nut looks almost good
The hardest sorting decisions involve nuts that look almost good, because discarding them feels like waste and keeping them feels like kindness to the harvest. Strictness matters precisely here, because almost good nuts are the ones most likely to be kept by every sorter, which means they are also the ones most likely to spoil a batch if their judgement was wrong. A clear personal rule helps: if you hesitate, discard, and let that hesitation be the signal rather than a reason to negotiate with yourself over a single nut.
Frequently asked questions
Can I trim mould off a nut and keep the rest?
No, trimming removes the visible part of the problem while leaving the underlying deterioration, and it can also spread mould spores to the knife, the bench, and neighbouring nuts. A mouldy nut should be discarded whole, and tools used near it should be cleaned before handling good nuts. Trimming is a technique for sound food with a damaged surface, not a rescue for a nut that is already bad.
Can a nut smell rancid while its shell looks perfect?
Yes, because rancidity develops inside the kernel even when the shell looks perfect, and it is often detected only by smell when the nut is cracked open. That is why sample cracking and smelling a batch are important even after shells have passed visual inspection. A batch with several rancid kernels should be sorted strictly, and any kernel with an off smell discarded immediately.
Does a tiny insect hole always mean the nut is bad?
Holes usually mean insects have entered or exited the nut, and the kernel inside may be damaged, contaminated, or partially eaten even if the hole looks small. Discard holed nuts rather than trying to judge how much damage lies inside, because the hole itself shows the kernel was exposed. Check neighbouring nuts too, since insect activity often affects more than one nut in a lot.
What does a soft shell or soft kernel indicate?
Softness can indicate damp, deterioration, or a kernel that never filled properly, and none of those conditions improves in storage. Squeeze gently during sorting, compare with known sound nuts of the same type, and discard soft nuts even if they show no mould or smell yet. Softness is an early warning, and acting on it early prevents a later, larger problem.
What to do next
Strict bad-nut rules protect good batches.