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The drill fluid used is normally a petroleum-derived liquid like kerosene.
It must have a suitable freezing point and viscosity.
Ice cores provide us with lots of information beyond bubbles of gas in the ice.
For example, melt layers are related to summer temperatures.
* Solar variation at 65°N due to en: Milankovitch cycles (connected to 18O). Ice core records allow us to generate continuous reconstructions of past climate, going back at least 800,000 years.
If we want to reconstruct past air temperatures, one of the most critical parameters is the age of the ice being analysed.
It is possible to discern past air temperatures from ice cores.