Medium fog, which produces a denser fog that persists longer than the light variant Supplied in a 1 litre plastic bottle Water-based, no stains! Optimised for use with DL fog machines but suitable for most makes of fog producers, the product is a water-based composition that leaves no oily residue. It is an odourless, non-irritating, non-toxic and non-flammable fluid. Two versions are available: “light” which produces a light fog that dissipates quickly and “medium” which produces a denser fog that persists longer. Supplied in 1-litre or 5-litre bottles.