Blue amber is a rare variety of amber. It has only been found in the Dominican Republic. Under artificial light, the amber appears like ordinary amber, but under sunlight it has an intense fluorescent blue glow. Blue amber emits a very agreeable smell, which is different from regular amber. There are several theories about the origin of Dominican blue amber, there is a great probability that it owes its existence to ingredients such as anthracene as a result of 'incomplete combustion' due to forest fires among the extinct species Hymenaea protera trees about 25 to 40 million years ago.