Almost 80 years of research and scientific tests support the same conclusion reached by the original German and American accident investigations in 1937: It seems clear that the Hindenburg disaster was caused by an electrostatic discharge (i.e., a spark) that ignited leaking .
The spark was most likely caused by a difference in electric potential between the airship and the surrounding air: The airship was approximately 60 meters (about 200 feet) above the airfield in an electrically charged atmosphere, but the ship’s metal framework was grounded by its landing line; the difference in electric potential likely caused a spark to jump from the ship’s fabric covering (which had the ability to hold a charge) to the ship’s framework (which was grounded through the landing line). A somewhat less likely but still plausible theory attributes the spark to coronal discharge, more commonly known as St. Elmo’s Fire.
This pen features an image if the Hindenburg and a piece of the airship skin cover.  The pen components are a black and brass color.