This article explains the difference between CMR-3173 (24 mm vial workflow) and the standard APHA and Gardner indices available in EasyMatch Essentials L2 and Quality Central and provides guidance on when each should be used.
Important Notes:
1️⃣ Results May Differ Slightly Between Methods
CMR-3173 and the default APHA and Gardner indices use slightly different internal calculation approaches, so small numerical differences may occur when comparing results between the two methods.
2️⃣ Legacy Data Continuity Should Drive the Decision
If your product specifications, quality limits, or historical reports were established using CMR-3173, continuing with that method may help maintain direct correlation with existing data.
3️⃣ Default Methods Are Recommended for New Workflows
For new installations, new product development, or customers without legacy CMR-3173 data, the default APHA and Gardner indices in Essentials L2 and Quality Central are the recommended and standardized approach moving forward.
Overview
CMR-3173 was originally developed to support a specific 24 mm glass vial transmission workflow in EasyMatch QC.
With the transition to Essentials L2 and EasyMatch Quality Central, APHA and Gardner indices follow the current standardized implementation used across HunterLab platforms.
While results between CMR-3173 and the current default methods are comparable, the internal calculation approach differs slightly. Customers who require strict correlation with historical data may prefer to continue using CMR-3173. For new implementations, the default indices are recommended.
When to Use CMR-3173
CMR-3173 may be appropriate if you have historical EZMQC data based on the 24 mm vial workflow, if your product specifications were established using CMR-3173 results, or if maintaining direct correlation with legacy reports is required.
When to Use the Default APHA & Gardner Methods
The default APHA and Gardner indices in Essentials L2 and EasyMatch Quality Central are recommended for new installations, new product development, customers without legacy CMR-3173 data, and standardized workflows moving forward. These methods align with current HunterLab software architecture and standardized calculation practices.
Practical Guidance
If you are unsure which method your system is using, review historical reports or contact HunterLab Support for assistance. We can help determine whether continuing with CMR-3173 or transitioning to the default indices is most appropriate for your application.
Recommendation
HunterLab’s recommended approach moving forward is to use the default APHA and Gardner indices available in Essentials L2 and EasyMatch Quality Central. CMR-3173 remains available to support customers who require legacy data continuity.
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To learn more about Color and Color Science in industrial QC applications, click here: Fundamentals of Color and Appearance