A fire and explosion did serious damage to a home in Long Beach on Wednesday. It seems that someone there was using an explosive gas to make what’s known as “honey oil,” a potent pot extract. There have been an increasing number of hash-oil related explosions in the last few years, a disturbing testament to the oil’s popularity. And, as with increased popularity of any consumer product, there is increased specialization. Yes: artisanal hash oil extracts. We get a primer on this growing trend.