Dean Morris designed Quicksilver at age 16 while in high school and submitted it to Letraset, who finished the character set and released it in 1976. His original name for the font was Polished Sausage, but the company didn’t go for that. The display face is reminiscent of neon tube lettering, but was actually meant to look like bent thermometers. See the designer’s own collection of uses. Alts for ‘C’ and ‘S’.
There is no official digital version. Allen R. Walden made the limited and badly spaced freebie Neon Lights. Tight is an antiqued version by Ray Larabie and comes with a range of ligatures.