Is Your Cashew Roast Colour Missing the Mark?

You spot a batch of roasted cashews and think they look perfect—but the flavor testers disagree, and shelf life is inconsistent. If your QA team relies on visual checks, you’re working with blind spots. Inconsistent roast colour means wasted product, unhappy customers, and lost revenue.

Here’s how two tools from HunterLab—Aeros and SpectraTrend HT—help you hit your colour targets every time, keeping your QA process tight, efficient, and repeatable.

From Raw to Packaged: Where Colour Can Slip

Let’s walk through a typical cashew roasting process. Colour issues can pop up at any point.

1. Preparation – You sort and clean kernels, then adjust moisture to 5–7%. Too much water = pale roast; too little = fast browning.
2. Optional Blanching – You steam to remove skins, then dry back to 5%. Inconsistent moisture here skews roast uniformity.
3. Roasting

• Oil roasting at 160–175 °C for 3–5 min. Pull at the exact gold hue—subjective guesses introduce errors.
• Dry roasting at 140–160 °C for 15–30 min. Without continuous colour checks, batches run pale or over-roast.

1. Cool & Season – Improper cooling affects final appearance and texture.
2. QC and Packaging – Visual checks and moisture tests help, but they miss subtle colour shifts until it’s too late.

That’s where objective colour measurement makes the difference.

Aeros and SpectraTrend HT – Best colour spectrophotometers for nuts

HunterLab offers two solutions depending on your production setup.

HunterLab Aeros (Benchtop, Batch Testing)

Ideal for lab sampling or QA tables.

• Non-contact & auto-height sensor handles irregular piles of cashews—no pressing needed
• Rotating platform captures 35 colour measurements across ~27.5 in² in 5 seconds, then averages them into one reading for consistent, repeatable results.
• One-button operation with full L, a, b data, ΔE pass/fail, and built-in display—no PC required
• Built-in indices & connectivity: Export results using USB and Ethernet connectivity, or stream data to LIMS/SPC
• Smart design with sealed optics, durable touchscreen, easy cleaning, and remote support

Aeros makes colour control fast, easy, and accurate—perfect for batch checks or lab settings.

Watch HunterLab Aeros in action >

SpectraTrend HT (In-line, Real-Time Monitoring)

Designed for the production line or continuous ovens.

• Non-contact, dual-sensor measures colour and sample height in rapid succession
• Up to five readings per second, even on uneven surfaces
• Compact and Rugged, industrially hardened NEMA 4 / IP66 design handles harsh plant environments
• Lab-grade colour data ensures inline readings match benchtop results
• Easy integration: Ethernet or PLC connection, plus colorWorkbench software compatibility for process control

SpectraTrend HT keeps your entire roast line in spec, catching drift before problems arise.

Watch SpectraTrend HT in action >

How They Solve Real-World QA Pain of Nut Manufacturers

1. Objective Colour Data

Use L*=68 ±2, a*=7 ±1, b*=20 ±1 and ΔE <2 thresholds. Both devices catch subtle shifts that visual checks can’t see.

2. Reduce Waste

When colour starts trending off-target, either instrument flags it—so you can adjust roast settings or redirect the batch, avoiding full failures.

3. Speed & Efficiency

Aeros gives you lab-ready readings in 5 seconds. SpectraTrend HT delivers real-time data without slowing production—no sample prep, no delays.

4. Traceability & Compliance

Both systems can provide you with precise colour data. Aeros can export reports. SpectraTrend HT integrates with SPC dashboards. Audit-ready, always.

5. Consistent Shelf Life

Uniform roast colour correlates with moisture reduction and controlled maillard reaction. That leads to consistent taste, texture, and longevity.

Real Results: Bring Precision to Your Nut Roasting

Your goals, our solution:

• Define your target colour specs.
• Run your first batch with Aeros.
• SpectraTrend HT keeps the line in check.
• Cut rejections by 30%, reduce roast variability by 20%, and improve customer satisfaction with colour you can count on.

Next Steps

• Talk to HunterLab experts. Figuring out which instrument fits your operation is easy.
• Book a demo and try either tool with your cashew samples.
• Start tracking your colour data and watch quality, consistency, and margins improve.

Both Aeros and SpectraTrend HT transform roast colour from guesswork into precise, controllable data. Pick the right one—then roast with confidence. Want help choosing or planning a pilot? Just ask.