Markets & Trade
Copper test: same bars, two certified systems
The assay table will publish repeat readings from the common weight and guild measures before the council takes up the standard.
Correspondent · Weights, measures, and buyer challenges
Darek Brol
Covers trade standards by comparing the marks on a rule with the work done at the assay table.
Latest reporting
4 stories
Markets & Trade
What the paired copper test can, and cannot, decide
The same bars will be checked under the common standard and guild weights. A repeatable reading is only one part of a fair market measure.
Markets & Trade
Ola Senn on one standard, two records, and a fair comparison
The licensed assayer explains why a shared weight is easy to compare and why guilds still want room to certify their own measures.
Markets & Trade
The worn notch on the market’s common weight
At the assay table, Ola Senn can certify a bar against the old standard. The faded maker’s mark has reopened a dispute over whether one weight should serve every guild.