I tutor postgrads for the GMAT and GRE exams. Last week I was chatting to one of them - these are supposed to be really intelligent people, right? Let's call him, Gabriel. Me: So what is it that you do, exactly? Gabriel relates to me his story of running a production line that makes engine blocks. A lot of metal turning goes on. Somehow or other the subject gets on to cooling the cutting machines. Now, in my schooldays I did technical drawing, so I have used a lathe and a milling machine, etc. Me: Ah, you must be using a lot of 'solly' oil. (soluble oil) Gabriel: Yes. It got too expensive so now we're recycling it, even the stuff that spills on the floor. Me: Really? (Thinks for a moment) Have you been getting many people with skin problems? Breakouts, boils, pimples, rashes. . . ? Gabriel: How did you know that? Me: Are you putting a preservative into the oil? It is an oil in water emulsion, a vegetable oil. You ARE using a broad spectrum preservative. Aren't you??? Gabriel: I will have to talk to management. It just comes in drums . . . Me: Take a sample to a lab and have it cultured and counted, see what they say.
I am pretty certain that the (warm) vegetable oil/water mixture must be an absolute soup of bacteria and fungi if it is being recycled and no preservatives. What do you think?
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