About 1885, a process by which natural gas heats a roasting chamber and hot air is the only heating medium was developed, and this remains the best and most popular method of roasting coffee.

• 大约1885年，用天然气加热烘焙箱、以热空气作为唯一的热媒介的工艺就已经被开发了，这种工艺至今仍是最好最普及的咖啡烘焙法。