You do not need a laboratory to spot good hazelnuts — you need to know where to look. Fresh nuts show intact shells, an even size distribution and a pleasant, faintly sweet smell. Rot, mould or a sour note points to storage or post-harvest faults; walk away from that batch.
Visual and sensory checks
Kernel colour and brittleness relate to roast profile and moisture. A healthy kernel is plump, its skin separates easily, and it snaps crisply when bitten. A rubbery texture signals excess moisture; darkened tips signal aged oil.
For industrial use, the moisture band is critical for target granulometry and oil release: kernel moisture below 5% is the precondition for both microbiological safety and shelf life, and buyers define that band explicitly in contracts.
Storage at home and in the plant
At home, an airtight container in a cool, dry, dark place is enough; refrigeration and freezing extend shelled kernels' life considerably. Hazelnuts absorb odours — keep them away from onions, spices and other strong smells.
When buying, ask for the producer's quality certificates and lot information. Transparency is the shortest route to trust: a supplier who can trace by lot can show you the source of any issue within minutes.
