So far my experiences in World 7 seem to indicate that if Full-nature character even touches the smelter in any way, chances taht ore turns into metal are reduced. Does anybody else have similar experience?
That is I always mine with full-industry character, but sometimes haul ore, put in fuel and loght it with full nature character which seems to have negative effect. Even though wiki pages explicitly say industry-nature afects metal only when ore is mined.