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I just recently watched the Director's Cut of Daredevil. In it, it shows that Murdock puts a white crystaline substance in his water before climbing into his bed. What was this?

enter image description here

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    My guess would be salt; it's easier to float in salt water Commented Apr 6, 2015 at 2:56
  • I thought that, too. But it seems to be, to me, too white to be salt.
    – PiousVenom
    Commented Apr 6, 2015 at 2:57
  • A cursory skim of Wikipedia suggests that it could be epsom salt, which is a very white powder Commented Apr 6, 2015 at 2:58

2 Answers 2

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I'm not aware of official word regarding the Daredevil movie1, but Murdock's "bed" closely resembles an isolation tank. To compare, here's Daredevil's tank:

Batfleck, pre-Batman Batfleck, part 2

And here's a guy laying in an actual isolation tank used in relaxation therapy:

A real actor. Also, an isolation tank

According to Wikipedia, modern isolation tanks use a solution of epsom salt to increase water density. Epsom salt is a very white substance:

Crystalline epsom salt

So I'm going to say the powder is probably that: epsom salt.


1 Truthfully, I think everybody involved just wants to purge it from their memory. But that's just me being cynical

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  • You show epsom as a powder, but as I mentioned in my question, and show in my picture, it's a very crystaline substance. That's not to say you're wrong. Just the image you posted looks nothing like what was used.
    – PiousVenom
    Commented Apr 6, 2015 at 12:24
  • @MyCodeSucks Looks like just a different level of granularity; I added a picture that's a bit more coarse-grain. Daredevil's looks like it's coarser still (it actually looks more like road salt to me, or water softener salt), but it's definitely some kind of salt Commented Apr 6, 2015 at 13:02
  • @MyCodeSucks looking at the article for epsom, it seems to come in a crystalline variety which looks more like the screenshot from the film - more here: en.wikipedia.org/wiki/Epsomite
    – jammypeach
    Commented Apr 6, 2015 at 13:03
  • As a kid, my family used to go through so much Epsom salts because my sister and I learned that we could add coloring (and essential oils) to make bath salts (this predates that being a common name for a drug) and insisting on making bath salts for all of the family, as gifts, etc. Even got our Junior Achievement group to make that a product one year...
    – FuzzyBoots
    Commented Mar 16 at 15:45
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The film's screenplay indicates that this is a floatation tank, and what he's putting in it are Epsom Salts.

WOMAN'S VOICE (CONT'D): Then I realized...this ia the next level.

Matt slides open a third drawer to reveal a white bag full of Epsom Salts. He scoops up a handful and steps into...

THE LIVING ROOM.
He stops before what appears to be a coffin. But then he opens the lid to reveal it's a FLOATATION TANK. He drops the Epsom Salts into the tank and strips off his costume.

WOMAN'S VOICE (CONT'D): Good-bye, Matt. I hope you find whatever it is you're looking for.

CLICK.

Matt slides into the warm water and closes his eyes.

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