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contained too much oleic acid. Stearic acid without a tempering agent takes on moisture, and after many experiments, it was found that Ceresine was ideal. To make the wax hard, sodium carbonate was added. Even so, a few batches of records still had problems and became fogged. The fog problem arose from acetic acid left in the wax and was solved when higher temperatures were used to make sure the acetic acid was boiled out of the wax. As such, the records from 1889 to 1894 are a reddish-brown color due to the long cooking time. By 1896, Edison

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