Geologic Fingerprint
Comparison of the relative abundance of strontium-87 and strontium-86 in a plant sample provides a direct link to the underlying bedrock of the cultivation site. Because strontium isotope ratios do not change as the element moves from the soil into the flax roots and through the spinning mill, they are considered the most reliable marker for provenance. This value remains constant regardless of the processing or aging of the linen fabric.
The application is limited to regions where the geological age of the soil is well mapped.
Bedrock Influence
Different types of rock, such as granite or limestone, possess characteristic ratios based on their age and initial rubidium content. As these rocks weather, the strontium is released into the groundwater and absorbed by the flax crop. Stalks of the plant incorporate the metal into their tissues as a substitute for calcium.
The resulting isotopic signature is a permanent record of the local geology.
Forensic Audit
Authenticity testing uses these ratios to verify that a batch of premium yarn actually came from a specific historic growing region. By matching the strontium in the sample to a database of soil values, inspectors can identify if a cheaper material has been substituted. This method provides the highest degree of certainty for high-value traceability claims.
Geological evidence offers a definitive check against fraudulent labeling.
