Abstract
Evidence is presented suggesting that potent water-insoluble antipentylenetetrazol agents triturated in porcelain mortars and pestles are not removed from this mixing device by the usual laboratory washing procedure. Moreover, amounts sufficient to contaminate the next substance triturated in this vessel can be demonstrated by the subcutaneous pentylenetetrazol seizure threshold test. The data show that a rigorous washing routine must be followed to achieve a “clean” mortar and pestle. Attention is also directed to the importance of using disposable hypodermic syringes, test tubes, etc., whenever possible and of designing an internal control test to determine when implements that must be reused are “clean.”
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