P-4 APPLE is an Antari scent additive for fog fluid that produces apple-scented fog when added to the fluid tank. The additive is intended exclusively for use with fog fluid and must be mixed at a ratio of 1 ml of scent to 1,000 ml, or 1 litre, of fog fluid. It is supplied as a 20 ml bottle. The product is identified by the manufacturer as P-4 APPLE.