Halloween pumpkins faces with bats grey background about jack-o-lantern Holidays

>For other uses, see Halloween (disambiguation). Halloween is an observance celebrated on the night of October 31, most notably by children dressing in costumes and going door-to-door collecting candy. It is celebrated in much of the Western world, though most common in the United States, Puerto Rico, Ireland, the United Kingdom, Canada and sometimes in Australia and New Zealand. Irish, Scots and other immigrants brought older versions of the tradition to North America in the 19th century. Most other Western countries have embraced Halloween as a part of American pop culture in the late 20th century. See more at Wikipedia.org...

>For other uses, see Flame (disambiguation). A flame is a self-sustaining oxidizing chemical reaction producing energy and ionized gas (plasma). It consists of reacting gases emitting light and infrared, which spectrum is dependant on the chemical composition of the burning elements. In many cases such as burning organic matter like wood or incomplete combustion of gas, incandescent solid particles (soot) produce the familiar red-orange 'fire' color light. This light has a continuous spectrum. Complete combustion of gas has a dim blue color due to the emission of single wavelength radiations from various electron transitions in the excited molecules formed in the flame. Usually oxygen is involved, but hydrogen burning in chlorine produces a flame as well, producing hydrogen chloride HCl. This gas dissolved in water is called hydrochloric acid. Other possible combinations producing flames (amongst many more) are fluorine and hydrogen or hydrazine and nitrogen tetroxide. See more at Wikipedia.org...