EugeneOregon
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The vacuum shown is reading ¾ of one micron. Room pressure is 760,000 microns and perfect vacuum is zero microns. This is deep vacuum. Mantle temp shown is 129C. Darker less pure extract is brown and in the bottom with a white PTFE stir bar zooming around. Light yellow on cold finger is nearly pure Delta 9 THC accumulating slowly. These are low pressures and so very low temps to evaporate D9 THC and catch it on the cold finger as a solid with ice water cooling the cold finger. D9 THC is solid at ice water temp. So when the gas evaporated from the liquid in the bottom (brown) it changed to a gas. When the gas contacted the cold finger the gas is frozen as a solid from gas form, skipping the liquid stage. This is called sublimation. Sublimation can also mean a solid changing directly to a gas.
An adjustment upwards of just ten degrees C will darken up the collecting compound with trace higher boiling impurities but it goes much faster. It just is not going to be clear and uber pure though generally it is trace amounts.
Two advantages of using this device slower at this low of temp is
1) The cold finger can collect way more because the heat from incoming gas collected as a solid (mostly) has time to get transfered away from the surface into the ice water. So the surface as it grows maintains the ability to freeze the D9 THC to a much greater degree and hold more, and
2) The higher boiling contaminates seem to be all but absent at the cold finger when the stir bar is spinning VERY fast and allowed time like this.