Science1 publisherNot yet confirmed elsewhere2 min readPublished
Tiny sparks igniting electrolysis hydrogen make pickles glow, a Portland State engineer says
Joshua Méndez Harper told a June electrostatics meeting that sparks at the fork, not heat, ignite hydrogen split from a pickle's brine. His version merges the two explanations that had competed for the trick, and so far it rests on a live demonstration and his own description of it.
The Scientist · Science desk
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What happened
- In the demonstration, two forks go into a pickle, the setup is plugged into a power source, and one end of the pickle glows.
- One older explanation held that boiling brine forms insulating gas pockets that shrink as the pickle cools, letting brine rush back toward the fork.
- The other said electrolysis splits the brine's water into hydrogen and oxygen, with heat from the electrodes setting off tiny hydrogen explosions.
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Why it matters
- exposure If the gas-and-spark account holds, anyone repeating this outlet-powered demo is making a flammable gas and sparking it, a hazard on top of the shock ScienceAlert already warns about.
- capability Tying the color to the salt gives the account a direct test: Méndez Harper says a pickle cured in a different salt would glow a color unique to that salt's elements.
- constraint The merged account still has only a tentative answer for the one-sided glow, the same observation Méndez Harper used against the arc-only story; ScienceAlert says that end is possibly where extra salt water collects.
Méndez Harper's version takes one part from each of those stories. Electrolysis supplies the fuel [6]. The arc at the fork supplies the trigger [4][11]. "There is hydrogen involved, but it's actually not heat that's igniting it," he said, adding: "it's the spark" [11]. He dropped heat, the trigger the electrolysis account had proposed [6]. "It's just like why you don't light a cigarette at a gas station. You're producing a spark that ignites the gas," he said [12].
The arc comes from the boiling cycle. "As that water comes back in toward the electrode a little arc crosses between the liquid and the electrode, just as when you reach for a doorknob and you get a zap," he said [4]. By itself, the arc left a gap. "That doesn't explain everything that happens, though," he said, noting that only one end of the pickle glows [5].
The color has a separate cause. According to ScienceAlert, the yellowish-orange light comes from excited sodium in the brine [7]. "You're exciting sodium ions, which produce that characteristic orange glow," Méndez Harper said [7].
The thing this doesn't tell you is what was measured. ScienceAlert's report covers a demonstration and Méndez Harper's description of it at the 2026 Electrostatics Society of America meeting [1]. It does not mention gas sampling, a spectrum, or a control run that would separate spark ignition from heat ignition. The outlet's own headline says physicists "may" have figured it out [9].
I think the account is plausible. Every step in it was already part of one of the two older explanations [3][6]. Its new claim is about which step lights the gas, and a measurement would have to test exactly that.
What to watch
- A written paper or proceedings from Méndez Harper reporting gas or spectral measurements behind the hydrogen-and-spark account.
- A measurement of brine distribution in a running pickle showing whether salt water really pools at the end that glows.