You did not say what type of alcohol, Most common types are isopropyl (rubbing alcohol) methanol (used in shellac) and ethanol (****, ****, whiskey) An ethanol-water solution that contains 40% ABV (alcohol by volume) will catch fire if heated to about26 °C (79 °F) and if an ignition source is applied to it. This is called its flash point. The flash point of pure ethanol is 16.60 °C (61.88 °F), less than average room temperature.