Visco fuse is required for all consumer fireworks. It is the fuse that, most commonly in green, is found as a twisted, coated, strand. It can also be used to create delays in the rate of firing multiple fireworks linked together. It is a cord with a black powder core. There are three layers to the visco fuse. First one layer of string is wound around the core, then a second, less tight layer of string is wound in the opposite direction to prevent unraveling. The last layer is a low-nitrate nitrocellulose lacquer. The last layer is to water-proof the strand and to prevent it from falling apart.
Cannon Fuse is a visco fuse that is most often thicker, steadier burning, and is coated to be more water-proof. Most cannon fuses of high quality can burn while under water. Cannon fuse is normally green or red in color. When using anything with a fuse, remember that it can't be put out.Fast burn visco, or Wasaq fuse, is most commonly yellow with burn rates of .6 to 3 seconds per foot, depending on manufacturer. It is used for short delays, or in 'fuse mines' (see flying fish mine).