https://www.nist.gov/publications/role-high-purity-noble-metals-precision-thermometry
The Role of High-purity Noble Metals in Precision Thermometry | NIST
Feb 17, 2017 - A variety of alternate calibration schemes which approximate the ITS-90 are possible when using high-purity noble metals.
the rolenoble metalsprecision thermometryhighpurity