Figure 2

Comparison of biogenic and synthetic samples (and difference plots below) from bottom to top: mesoplodan rostrum (90.80 Ash%, 10.37 wt% CO₃²⁻) and synthetic (7.52 wt% CO₃²⁻), bovine (69.29 Ash%, 7.00 wt% CO₃²⁻) and synthetic (8.12 wt% CO₃²⁻), cervine antler (55.63 Ash%, 5.43 wt% CO₃²⁻) and synthetic (5.83 wt% CO₃²⁻).