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

  • 1
    My guess would be salt; it's easier to float in salt water Apr 6, 2015 at 2:56
  • I thought that, too. But it seems to be, to me, too white to be salt.
    – PiousVenom
    Apr 6, 2015 at 2:57
  • A cursory skim of Wikipedia suggests that it could be epsom salt, which is a very white powder Apr 6, 2015 at 2:58

2 Answers 2


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

  • 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
    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 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
    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
    Mar 16 at 15:45

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...

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.


Matt slides into the warm water and closes his eyes.

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