So, what is ectoplasm actually supposed to be?

What is ectoplasm and where did it come from?

Turns out "ectoplasm" wasn't even a ghost word originally. Biologists used it first, for the outer layer of a cell. Spiritualists borrowed it in the late 1800s to describe a substance mediums claimed to produce during séances: sometimes a pale mist, sometimes something thicker, almost gauze-like, that could apparently form into shapes or faces. The theory was that it acted as raw material a spirit could use to briefly manifest. It was supposedly fragile and light-sensitive, and it would dissolve if the séance got disrupted.

Here's the less mystical part though: a lot of the famous "ectoplasm" photos from the early 1900s were traced back to cheesecloth, muslin, and egg white, swallowed or hidden beforehand and produced on cue. Several well-known mediums got caught doing this exact trick, which is a big reason the term has a bit of a punchline reputation now.

Still, the word stuck around. Modern ghost shows use it as shorthand for "physical proof a spirit was here," some kind of leftover trace after a sighting, not just a feeling. Worth knowing the history before chasing down whether there's actually residue anywhere.

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