Electrum

Electrum is a golden liquid with the special property of bonding to metal and rendering it virtually indestructible.
Liquid electrum is combustible, but it has a considerably higher spark-point than liquid energon—a stray blaster shot will not ignite it, but a direct high-power shot will.
Electrum-augmented Transformers turn a golden color.
Fiction
The Transformers cartoon
Most Transformers were unfamiliar with electrum, and the scientist Starscream was apprehensive about its properties. Beachcomber discovered an isolated "lagoon" full of electrum in a natural preserve, which was promptly seized by the Decepticons. Megatron destroyed the electrum rather than let the Autobots have it. The Golden Lagoon
Dreamwave Generation One continuity
Electrum was an element with a molecular structure that could be grafted only onto inanimate material. Jetfire noted that Sunstorm's body was constructed of a substance similar to electrum, a byproduct of Cybertronian bio-mechanics. Skyfire
Beast Wars: Uprising
Electrum was a theoretically illegal substance on post-war Cybertron. Usually, the production and sale of "leccy" was through street gangs, but those with Builder connections could score some samples easy. When the Grand Uprising broke out, orders from on high came down to the Maximal Command Security Force to ignore electrum pushers in favor of the "bigger picture".
While examining the dead Twirl's memories, MCSF officer Wolfang noted some showed signs of either excessive engex use or electrum. Trigger Warnings
Games
Live-action film series

Decepticon drones erected a series of gray blockades fortified with the Cybertronian alloy electrum.
Ironhide could use nova spray to turn the blockades brittle and destroy them. Mobile phone game
Transformers Legends
Beachcomber stumbled on a Golden Lagoon full of Electrum. Thrust also found it, and soon the Decepticons had all coated themselves and made themselves invulnerable. Though Megatron's forces soon had a victory over Omega Supreme, the Autobots coated themselves in Electrum too, and in the ensuing battle, the lagoon and surrounding glen were destroyed. The Golden Lagoon
Transformers: Earth Wars
Toys
Generation 1
- Meister (2003)
- Japanese ID number: C-06
- Accessories: Photon Rifle, Missile launcher, 3 missiles

- This version of reissue Jazz is almost entirely constructed of vacuum-metallized gold plastic, based on Jazz's incredibly brief, non-speaking appearance in "The Golden Lagoon". This re-issue is a homage to special gold-colored toys 20 years earlier which was declared 'electrum' to give it a stronger tie to Transformers continuity. A silver edition of Bluestreak received no such explanation.
- Meister was an e-HOBBY exclusive, sold with Streak (anime version).
Notes
- In the real world, electrum is an alloy of gold and silver. This is referenced by Perceptor finding a rock containing gold and silver just before Beachcomber discovered the lagoon. .
- When Optimus Prime is submerged in energon in The Transformers Trilogy, he is covered with an invulnerable "silver coat". This appears unrelated to the way electrum works (the Matrix was involved, to begin with...).
- Though Japan has had numerous all-gold repaints as Lucky Draw figures (most of them being Optimus Prime), none of them officially represent electrum coated characters.

