Dreadstone walls should be prototypable using alchemy engine

Nightmare Werepig drops a lot of blueprints. Their amount could be reduced a bit. And dreadstone walls are a good choice to remove from Nightmare Werepig loot. 
They are the shadowy equivalent of moon rock walls, which can be prototyped in the alchemy engine, so dreadstone walls could be prototyped at this science station. 
Additionally, if they were prototypable, new players might know that such a resource as dreadstone exists and wonder where to get it.