Thomas Hancock helped make this material practical to use, while the actions of Henry Wickham broke a Brazilian monopoly in this substance.
It's not amber, but one promoter created an entire room made out of this substance for the Crystal Palace exhibition. Thomas Hancock helped make this material practical to use, while the actions of Henry Wickham broke a Brazilian monopoly in this substance. The Force Publique cut off the hands of workers harvesting this good in the Congo Free State under Leopold II. For 10 points, name this product whose material properties were greatly improved by Charles Goodyear.
It's not amber, but one promoter created an entire room made out of this substance for the Crystal Palace exhibition.
Vulcanized {Rubber}