Matched to samples of the metal.
Because it occurs naturally in the alluvial sands of various rivers, it was first used by pre-Columbian South American natives to produce artefacts.
It was referenced in European writings as early as 16th century, but it was not until Antonio de Ulloa published a report on a new metal of Colombian origin in 1748 that it began to be investigated by scientists.
Similar to French Grey. Historically, nettles have been used to make clothing for 2,000 years, and the grey German Army uniforms were almost all made from nettle fibre during World War I due to a potential shortage of cotton.