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The idea of giving the Xenomorph acid blood came from conceptual artist Ron Cobb , in response to screenwriter Dan O'Bannon 's insistence that the creature be a mortal organism, but have some characteristic that prevented the crew from killing it.  In Alien and Alien 3 , shots of the acid blood dissolving through flooring were achieved using a combination of styrofoam for the solid surface and a mixture of chemicals for the blood. In Alien , the blood mixture was mainly composed of chloroform, acetone, cyclohexylamine and acetic acid, with other compounds in minor quantities. "We produced a mixture of chemicals that actually was pretty corrosive — you wouldn't want to get it on your skin, you know," explained special effects supervisor Brian Johnson. "That stuff just ate right through the styrofoam, but it left enough color behind so it really looked like metal." 
The examples in my book include a fairly simple way of getting around the heat loss problem.
Can we think of people such as Gandhi as performers of ethical breaching experiments?
-- JWSchmidt 20:54, 20 March 2010 (UTC)
In reaching its Decision, the Commission has gathered and comprehensively analysed a broad range of evidence, including: