Where For K-feldspar, the average % recovery in the centrifugal wash pellet was 159% (median = 100%, 25 th -75 th percentile = 64% to 176%), indicating that the majority of the K-feldspar in the original suspension is successfully collected after washing (Figure and Figure ). The % recovery values varied significantly from experiment to experiment (see different symbol types in Figure ). This variability can be explained, at least in part, by inhomogeneity in the K-feldspar suspensions, which leads to variability from experiment to experiment, even for unprocessed samples (see discussion above). In addition, the variability may be partially explained by small variability in pipetting technique from experiment to experiment. Variability in the pipetting technique could impact INS recovery by causing variability in how much of the centrifugal pellet is disturbed and reenters the supernatant during supernatant collection.