Our Dense fog formula is the flagship of our FogMasters fog fluid line. It produces a very dense, long-lasting fog. The density is amazing, creating a thick fog that causes things only a few feet away to disappear if the fog machine is allowed to run constantly. The hang time is good, but not quite as long-lasting as our Long-Lasting formula. When this fog is chilled (with a low-lying fogger), this formulation will create that long-lasting thick as pea soup fog effect.