We evaluated the recoveries of inorganic and organic INSs in the high-and low-density isolates, respectively, using a mixture of K-feldspar and Snomax INSs. This mixture was prepared by combining the previously described K-feldspar and Snomax solutions in a 1:1 ratio. The freezing results for the mixture were compared to unprocessed K-feldspar and Snomax suspensions, which were prepared by combining the original K-feldspar and Snomax INS suspensions with ultrapure water in a 1:1 ratio (Figure ). The freezing curves for the high-density isolates were similar to those for unprocessed K-feldspar, but shifted to slightly colder (~1 °C) temperatures, suggesting that a large fraction of the K-feldspar INSs, but not all,