Calamine brass a mixture of the virtually indistinguishable zinc ores smithsonite and hemimorphite) as the zinc component of brass. The resulting brasses, produced by heating a mixture of copper and calamine to a high temperature for several hours (allowing zinc vapor to distill from the ores and permeate the metallic copper), contained a significant amount of slag material resulting from the non-zinc components of calamine. The use of ore rather than metallic zinc also made it difficult to accurately produce the desired final proportion of copper to zinc. This process is known as cementation. Calamine brass was produced using proportions of two-sevenths
Extracted of "Electric Sheep" called it "an excellent science-fiction thriller that, while reminiscent of a number of other films ... improves on all its predecessors". Jeremy Kirk of First Showing rated it 8.5/10 and described it as "a classic case on how indie science fiction works", focused on character and narrative. "Starburst" rated it 5/10 stars and wrote that the film's execution falls short of its "fascinating, thought-provoking" premise. Extracted Extracted, also known as Extraction in the UK, is an independent 2012 American science fiction thriller directed and written by Nir Paniry. Sasha Roiz stars as a scientist whose consciousness becomes