JEM ProFog High Density Water-Based Fog Fluid BOX OF 4x2.5LJEM Pro Fog Fluid, High Density is best described with the characteristics of high density, white airborne fog, with long hang time; it has a slow evaporation rate and a high index of refraction. In environments unaffected by air conditioning and extraction, JEM Pro Fog Fluid, High Density can be expected to dissipate 30% slower than JEM Pro Fog Fluid. This makes it well suited for scenic obscuring, strobes, and white out conditions which is why it is