Copper test: same bars, two certified systems

TEST: The assay table will weigh the same set of copper bars under the old common standard and the guild-certified weights.

RECORD: Each slip is to name the bar, its shape, the weight used, the reading, and the assayer who made it.

QUESTION: The test can show whether readings are repeatable across systems. It cannot decide whether buyers can compare stall prices without knowing which standard produced a number.

CONTEXT: Guilds say one weight can hide differences in bar shape; buyers say several standards make comparison harder. The worn maker’s mark on the common weight remains part of the challenge book.

NEXT: The slips will be posted before the council recommends a standard. No replacement has been approved.