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Regardless of whether one has the powdered salt (from China), or a bottle of liquid solution of the salt, the process is as follows:
Place some of the dry pentobarbital crystals from the previous acid conversion test into the capillary and suspend the capillary in the cooking oil. Keep the glass tip of the capillary close to the sensing tip of the digital thermometer. Heat the oil slowly on the stove while stirring the oil continuously. Watch for the point at which the melting of the crystals occurs. The crystals should change colour quickly from white to transparent at 1310
C +/- 10 C.
A video of the MPT is shown: ‘The Melting Point Test for Nembutal’.
Note: In the video a magnetic laboratory stirrer is used to ensure a uniform temperature of the cooking oil being heated.
c) The Dilution Purity Test (DPT)
The DPT test looks for the point at which a sample of Nembutal (powder or liquid) becomes so dilute as to not give a ‘positive’ on the qualitative ‘Spot test’ cassette. Adulterated or degraded Nembutal samples will require less dilution to reach this point.
Accurately weigh out 200mg of powder to be tested. Dissolve this powder in ~20ml of distilled water taken from one of the 2 liter distilled water bottles - label this bottle #1.
Return the 20ml of water with the dissolved substance back into the 2 liter container. Re-seal and tip up and down several times to mix the sample thoroughly.