→ 1. Spectral Analysis

Burnt mark on arrowhead from ASTM E1999-18 testing protocols. The testing confirms that the arrowhead is a purposeful copper alloy with 1% tin and 0.03% silver. The tin shows that the ancient people in America understood how the addition of this element had a profound impact on the hardness of the copper alloy. Also, the small percentage of silver confirms that Upper Michigan is the source of the native copper.