# Concert sound/stage - what are these gas cylinders for?

**URL:** <https://boards.straightdope.com/t/concert-sound-stage-what-are-these-gas-cylinders-for/951522>\
**Category:** Cafe Society\
**Tags:** music\
**Created:** [September 28, 2021, 4:02pm UTC](https://boards.straightdope.com/t/concert-sound-stage-what-are-these-gas-cylinders-for/951522 "2021-09-28T16:02:27Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![Ike\_Witt](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/ike_witt/32/283_2.png) [@Ike\_Witt](https://boards.straightdope.com/u/Ike_Witt)\
**Post date:** [October 2, 2021, 12:28am UTC](https://boards.straightdope.com/t/concert-sound-stage-what-are-these-gas-cylinders-for/951522/21 "2021-10-02T00:28:01Z")

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Am I the only person who thinks that Joker may be about to try something?

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**Author:** ![Dr.Strangelove](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/dr.strangelove/32/6613_2.png) [@Dr.Strangelove](https://boards.straightdope.com/u/Dr.Strangelove)\
**Post date:** [October 2, 2021, 12:47am UTC](https://boards.straightdope.com/t/concert-sound-stage-what-are-these-gas-cylinders-for/951522/22 "2021-10-02T00:47:13Z")

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> [@jnglmassiv](#):
>
> You’re right though, green normally indicates, if not argon specifically, another inert gas.

Yeah–impossible to read the text, but the graphic is clearly:  
[https://www.interplas.com/product\_images/dot-labels/D.O.T.-Non-Flammable-Gas-Label-Transportation-Hazardous-Materials-2-1000px.jpg](https://www.interplas.com/product_images/dot-labels/D.O.T.-Non-Flammable-Gas-Label-Transportation-Hazardous-Materials-2-1000px.jpg)

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**Author:** ![Dadtheinhaler](https://avatars.discourse-cdn.com/v4/letter/d/e480ec/32.png) [@Dadtheinhaler](https://boards.straightdope.com/u/Dadtheinhaler)\
**Post date:** [October 2, 2021, 8:49pm UTC](https://boards.straightdope.com/t/concert-sound-stage-what-are-these-gas-cylinders-for/951522/23 "2021-10-02T20:49:50Z")

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I found a picture I took with another camera that I was able to zoom in on. Carbon Dioxide it is.

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