The key goal of JIP research on dispersant use in ice was to expand the existing knowledge base on dispersants to allow responders and decision makers to know when dispersants could be efficiently used. There is an extensive knowledge base on dispersant use in cold climates. This has led to an understanding of what oil types and environmental conditions allow effective dispersant use. Most of these tests, however, focused on oil types, oil weathering states, and environmental conditions that were expected to be conducive to effective dispersion to show that cold temperatures and ice don’t completely eliminate dispersion. In the JIP project, we attempted to study oils, weathering states, and environmental conditions that were more challenging to effective dispersion in order to identify boundaries for dispersant use.