Usually, it's strontium (Sr, #38). It burns a bright red as it oxidizes. This distinctive color is also evident during flame tests of strontium solutions.
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Strontium compounds, such as strontium carbonate or strontium nitrate, are commonly used in fireworks to produce a vibrant red color when they burn. When these compounds are heated, they emit red light, giving off the characteristic red color seen in fireworks displays.
The red color is probably caused by either strontium or lithium. Both elements burn with a red color.
Yellow usually comes from sodium while gold coloration usually comes from iron.
There are several possibilities, but sodium lines dominate all the rest.
Purple fireworks get their color from a combination of strontium (red) and copper (blue) compounds in the fireworks composition. When ignited, these elements emit light at specific wavelengths that combine to produce the color purple.
Strontium will produce different colours dependant on the circumstances. If the flame has oxygen and hydrogen present, the flame will be red. With chlorine in the flame it will be a brighter red. If it is the strontium atoms excited by themselves they produce a violet colour.
The colors produced by fireworks indicate the type of chemical compounds used in the firework composition. For example, strontium compounds produce red color, copper compounds produce blue color, and barium compounds produce green color. Different combinations of chemicals can create a wide range of colors in fireworks displays.
Strontium is used in fireworks to produce a bright red color when ignited. It is commonly used in combination with other metal salts to create an array of vibrant hues in fireworks displays.
Different compounds are responsible for producing different colors in fireworks. For example, strontium salts produce red, barium salts produce green, copper salts produce blue, and sodium salts produce yellow. When these compounds are heated, they absorb energy and then emit light in the form of colors.