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Handling Inconclusive Test Results in Hallmarking: Guidelines for Jewellers

Accurate test results are crucial in the hallmarking process to ensure the purity and authenticity of precious metal jewellery. The Bureau of Indian Standards (BIS) has established guidelines to address situations where test results are inconclusive. This article delves into the procedures for handling such cases and the steps jewellers must take to ensure compliance and maintain quality standards.

Understanding Inconclusive Test Results

Inconclusive test results occur when the repeatability in duplicate determinations, as specified in Clause 10.2 of IS 1418:2009, is not achieved. Repeatability refers to the ability to obtain consistent results across multiple tests. If the results vary significantly, the test is considered inconclusive, indicating that further testing is necessary to confirm the jewellery's purity.

Procedures for Handling Inconclusive Results

When test reports indicate that repeatability is not achieved, the results are deemed inconclusive. In such cases, BIS guidelines stipulate that a fresh sample must be drawn from the jeweller within 30 days of receiving the initial test report. This ensures that the testing process is fair and accurate, allowing for verification of the jewellery's quality.

Retesting Process

To address inconclusive results, jewellers must submit new samples for testing. The process involves the following steps:

1. Notification: The jeweller is informed of the inconclusive results and the need for a fresh sample.
2. Sample Collection: A new sample is drawn from the jeweller's stock within 30 days.
3. Submission: The fresh sample is submitted to the BIS referral laboratory for retesting.
4. Testing: The laboratory conducts the tests on the new sample, aiming to achieve consistent and conclusive results.

Common Questions and Answers

What does repeatability in duplicate determinations mean? Repeatability in duplicate determinations refers to the ability to achieve consistent test results across multiple attempts. If the results vary, it indicates a lack of repeatability and renders the test inconclusive.

How should jewellers handle inconclusive test results? Jewellers should promptly provide a fresh sample for retesting within 30 days of receiving the inconclusive test report, ensuring compliance with BIS guidelines.

What is the timeline for submitting fresh samples? A fresh sample must be drawn and submitted for testing within 30 days of receiving the initial inconclusive test report.