t-dub
Vapor Sloth
Edit: After looking into Butane contaminants I found that many are heavy metals and therefore would concentrate the way Weedemon suggests. From my research into super-critical CO2 extraction:
"Currently, a popular extraction solvent is butane which can potentially leave heavy metals behind in your finished product."
t-dub
"Currently, a popular extraction solvent is butane which can potentially leave heavy metals behind in your finished product."
t-dub