The Wikipedia article on sulfur confirms the flame color: Sulfur burns with a blue flame with formation of sulfur dioxide, which has a suffocating and irritating odor. But is that the original rationale for “blue blazes”? Also, when and where did the earliest recorded instances of “blue blazes” and “blue blazes of hell” occur?

 https://english.stackexchange.com/questions/529891/why-does-blue-blazes-specify-the-color-blue-and-what-is-the-origin-of-this-ex