The time course patterns of the cumulative percent positive skin irritation responses for each test material compared to 20% SDS,
for each of the 7 studies, are shown in Figs. 1A–7A. Symbols on each graph indicate those formulations significantly more or less irritating than 20% SDS at the terminal patch exposure time point. Those formulas that showed no significant difference in skin irritation responses vs. SDS and those formulas that showed significantly more skin irritation responses than SDS would be considered irritating to skin under these specific exposure conditions. Those for- mulas that showed significantly less skin irritation than SDS would be considered non-irritating under these specific exposure conditions. The time response curves