Most of the major developments impacting contemporary candlemaking occurred during the 19th century. In the 1820s, French chemist Michel Eugene Chevreul discovered how to extract stearic acid from animal fatty acids. This lead to the development of stearin wax, which was hard, durable and burned cleanly. Stearin candles remain popular in Europe today.
In 1834, inventor Joseph Morgan helped to further the modern-day candle industry by developing a machine that allowed for continuous production of molded candles by using a cylinder with a movable piston to eject candles as they solidified. With the introduction of mechanized production, candles became an easily affordable commodity for the masses.
Paraffin wax was introduced in the 1850s, after chemists learned how to efficiently separate the naturally-occurring waxy substance from petroleum and refine it. Odorless and bluish-white in color, paraffin was a boon to candlemaking because it burned cleanly, consistently and was more economical to produce than any other candle fuel. Its only disadvantage was a low melting point. This was soon overcome by adding the harder stearic acid, which had become widely available. With the introduction of the light bulb in 1879, candlemaking began to decline.