At pH 7, misclassification occurs for 2 samples, but only between brands from the same distillery. At pH 10, misclassification occurs for 2 samples, including one between distilleries. Under negative ionisation, a single misclassification occurs for a Glenfiddich 12 sample, which the sample classed as Gentleman Jack. Therefore, the best sampling conditions are confirmed once more to be positive ionisation with no pH modification.