In these experiments, the freezing curves of K-feldspar with 1% v/v OptiPrep™ overlap with those of Kfeldspar without OptiPrep™, indicating that OptiPrep™ does not have a significant impact on the freezing properties of K-feldspar (Figure ). The freezing curves for Snomax with 1% v/v OptiPrep™ also appear to overlap with those of Snomax without OptiPrep™, but on average, appear to be shifted slightly to warmer temperatures, suggesting that OptiPrep™ may slightly enhance the ice nucleation efficiency of Snomax.