Another special effect is fog machines or pyrotechnic smoke. Fog is typically used for indoor venues where the pyrotechnic smoke can be created in greater quantities for outdoor events. Nearly any color of smoke is available. Smoke can be used to create a dramatic backdrop, to create a smoldering fire effect or simply as a unique way to simulate a fuse burning that starts your large fireworks display. Fog and smoke often achieve maximum impact when used in combination with laser and light displays.