Residual Quat Testing for Nuts & Grains

SKU: 33819-100

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Ensure nuts and grains are free of quat residues with Indigo® QAC test strips. Protect consumers from allergen cross-contact, verify sanitation practices, and meet HACCP, FSMA, and organic certification requirements.

Sanitation is essential in the processing of nuts and grains, where both microbial safety and allergen control are critical. Indigo® residual quat test strips can detect down to 10 ppm & provide food processors with an easy, reliable way to verify that no sanitizer residues remain after standard following mandated cleaning procedures. This is especially important in facilities that handle allergen-prone foods such as peanuts, tree nuts, wheat, and soy, where consumers are already highly sensitive to contamination risks. By confirming low or no quat residue, producers can reassure buyers, regulators, and allergy-conscious consumers that their products are both safe and compliant with industry & government standards.

All Indigo® Quat (QAC) test strips come in 100 (not 50) strips per pack & 3 year minimum guaranteed shelf life backed by a Certificate of Analysis, Stability & SDS documents as listed below; Certificate of Conformance on request. Be prepared for any health & safety audit or inspection.

Details

Best Practices for Nuts & Grains Processors

  • Confirm residues on drying racks, silos, and packaging surfaces ensuring ≤100 ppm, using Indigo® residual QAC test strips which detect down to 10 ppm..
  • Reduce residue risk in allergen-sensitive operations (e.g., nut-free labeling, cross-contamination prevention).
  • Show compliance with HACCP, FSMA, and export certifications to meet international trade requirements.
  • Strengthen brand reputation for allergen-conscious and organic-friendly grains.

 

The directions on the test strip bottle are for testing liquid quat solutions. Test surfaces for residues by first wetting the strip's testing pad with water (deionized or distilled if available). Then press against fruits, vegetables, cutting boards, utensils, etc. for at least 10 seconds & then compare against the color chart.

Levels less than "10" ppm are impossible to determine but some organic certifications call for "0" ppm. This is because water alone causes a reading of 10ppm. Read more in our blog on What 10ppm really means? when measured on surfaces of knives, cutting boards, fruits or vegetables.

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Specifications

Swish strip in liquid 5 times & then compare to color chart after 10 seconds for reading at ≤10-30-60-80-100ppm ppm for quaternary ammonium disinfectant concentration.

  • Indigo® test strips have a guaranteed minimum 3 year shelf life but are stored in desiccant lined vials so actual shelf life can be 5+ years.
  • For technical explanation, read: Sanitizer Test Strip Expiration; Good Today, Dead Tomorrow?
  • These strips measure any quat formulation
  • Indigo® QAC test strips are calibrated for Oasis 146: see details. Consult your supplier if necessary.
  • The number of strips (100) per vial is approximate.
Documentation

Test Strip Documentation

Stability Statement Certificate of Analysis SDS
Indigo Quat - QAC Test Strips 10-100ppm Stability Statement Indigo Quat - QAC Test Strips 10-100ppm Certificate of Analysis Indigo Quat - QAC Test Strips 10-100ppm SDS

Indigo® brand test strips are Made in USA & tested for accuracy using NIST compliant standards. Be prepared for any health & safety audit or inspection.

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