The pail containing the immersion pump is filled with water and ice, the pump is turned on, and the condenser is filled with circulating icewater. The oil in the oil bath is heated by turning on the electric hotplate. The temperature is raised slowly (indicated on the thermometer), giving the solution in the flask time to heat the temperature of the bath. The temperature is noted at which the solution of cannabis oil and acetic anhydride begins to fume and droplets of pure acetic anhydride form in the condenser and fall back into the solution. The temperature is slightly raised until the solution in the flask begins to boil. The bath temperature is stabilized at this point. This is continued for three hours. Ice is supplied

as needed to the container with the immersion pump. Marijuana zaden aka wiet zaden. After three hours of refluxing, the electricity to the hotplate is turned off and the solution is allowed to cool to room temperature. Ice water is kept circulating through the condenser. After the solution has remained at room temperature for at least two hours, the rubber stopper at the top of the condenser is checked.