Fire Salt

"Hey Steven! Do you want to try some special new french fries...?"

"Fire Salt" is a magical dust first used by Amethyst to prank Steven in "Joking Victim". Later in the episode, Steven and Sadie used it to prank and get revenge on Lars for lying and skipping his shift at the Big Donut.

Appearance
Fire Salt is an edible mix of many types of magical red powders and is held in a translucent, reddish-colored tube with a red, crystalline stopper.

Effects
Fire salt causes a burning sensation when consumed. Varying amounts has different effects. A small amount would cause an extremely intense spicy flavor, but if too much is eaten, it can cause the consumer to spew fire from their mouth. It is hard to stop the person from spewing fire, as when Lars consumed a large amount of fire salt and ran through a giant bowl of ice cream, the flames coming from his mouth were still not extinguished. It was only when the fire salt covered food was removed did the fire stop.

Pure Gems seem to be immune to the effects of the fire salt as Amethyst is seen enjoying her "special fries" throughout the episode, but humans and half Gems half humans like Steven are affected.

Trivia

 * In the Steven Universe comic issue #6, Amethyst used fire salt to win a hot dog eating competition by "spiking" the other contestants' hot dogs with it, which of course, is cheating.
 * It is unknown from where Amethyst acquired the Fire Salt.
 * The fire salt also appears in the RPG "Attack the Light" as a useable item. It makes all the attacks of the selected Gem burn their enemies.
 * The effects of The Fire Salt on Lars (fire breath) seemed to change with his mental state, when he was angry his fire breath increased and when he was calmed down by Sadie he stopped breathing fire.