Bluebell Flames

"I frantically whipped out my wand, "Caeruleum Flamme!" my wand shot out a jet of the same bluebell flames I had used on Snape at the plant. The Devil's Snare let go of Harry and he caught his breath again.
 * — Harriet Riddle using Bluebell Flames against the Devil's Snare
 * Bluebell Flames (Caeruleum Flamme), also known as Cold Fire, was a charm that produced magical blue flames with distinctive properties.

Effect
Bluebell flames were bright blue in exterior and were waterproof. Not as hazardous as actual fire, these magical flames could be touched, penetrated, and held without it burning the bearer, though it was known to singe substances such as clothing and plants. As such, it might be securely transported in small objects, such as a jar, without the object being damaged. These distinctive flames could also be geared towards a desired location by its caster and return to its original location.

Known Practitioners
Harriet Riddle