If the ignition occurs immediately, hold the candle steady and allow the ignited flame to move away. Timing starts when ignition occurs. Distance is measured from the point of ignition.

• 如果样品立刻燃着了，使蜡烛保持稳定让燃着了的火焰向前延伸。从火燃着的时候开始计时。燃烧距离从着火点开始测量。