Ignition .... ......Liftoff Once the spark reacts with The firework is blown into the the qunpowder in the middle sky from a mortar - essentially a of the firework it causes an tube with more gunpowder at intense reaction and the the bottom. Once lit. the gunpowder explodes outward combustion spreads to the next in a shower of light. layer of material and ignites it. Coloured chemicals Shell This layer has coloured salts A modern firework has a plastic reacting with the gunpowder， shell， which will explode once producing the different coloured the charge ignites the sparks. The very middle of the gunpowder in the middle of the S firework houses a small shell that firework. This burns slowly as produces the signature bang. the firework is blown into the air. 026 5 How It Works WWW.HOWITWORKSDAILY.CO