O ile rozumie, to cos z opowiesci o Supermenie, a wiec to kwas nie istniejacy, nazwa nawiazuje do bajecznego miasta Beltric:
http://www.courts-of-chaos.com/fayry/ftale1.htm

...Using his x-ray vision, Superman sees that Jimmy has broken his leg. But the biggest disaster is yet to come. The plant produces "Beltric" acid. Under normal conditions, this is just an acid, but when that substance reaches 180 degrees, this substance becomes a "super" acid and if an explosion occurred it would send a cloud over the area destroying all that it touched. Realizing the peril, Superman flies to a nearby lake, freezes the surface with his super-breath, then flies the frozen lake to the plant. High above the plant, he lets the ice drop above the fire. As the ice falls, it begins to melt when it meets the hot air from the fire. Like rain, the water douses the flames, lowering the temperature and preventing the acid disaster.
http://www.fortunecity.com/lavender/greatsleep/1023/m-movie3...