Minecraft wiki entry for Fire, associated text: Sometimes, in survival, when the player walks into a fire briefly and walks out quickly enough, the player takes minor damage, but does not stay on fire.
Fire uses two texture files, one for the inner fire and one for the outer fire.
Each end crystal continuously generates a block of fire at its location, if the crystal is placed or generated in the End.
While soul fire was not announced until MINECON Live 2019, a similar-looking blue fire was seen in the spin-off game Minecraft: Story Mode, several years earlier.
Minecraft Dungeons also has a similar feature whenever a wraith attacks.
There is also a purple fire seen in Minecraft Dungeons.
Soul fire can not be placed on any other block other than soul sand or soul soil, even if it's placed with /setblock.‌[Java Edition only]
Both types of fire have the third highest number of possible block state combinations, at 512, behind note block's 800 and redstone dust's 1296.