Waste vegetable oil is commonly used for producing biodiesel and becomes degraded during the cooking process into it's constituent fatty acids. This can also happen with new oil if the raw seeds have not been stored properly. The acidity can not be measured with a pH meter or litmus paper as it is n...By: Tecwyn Twmffat
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from Instructables: exploring - technology - robots http://ift.tt/1CNcH2H
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