On the other side, Richard was unaware of what had taken place at the mine—nor the matter with Mallen. All he did was lead Prince Gelo and his entourage toward their next destination.
To create cobalt blue, they needed three ingredients: cobalt ore, aluminum oxide, and phosphoric acid.
They had already obtained the cobalt ore, and the phosphoric acid was readily available, so now the only issue to resolve was the aluminum oxide.
Generally speaking, in this world akin to the Medieval era, anything associated with metallic aluminum was hard to come by. The main reason for this was the scientific limitations of the current world, which made the extraction of aluminum difficult. That is why, back in the Blue Lion Kingdom, they had chosen to prepare ether using the experimental method rather than the industrial method catalyzed by metallic aluminum.
