Check this out:
https://www.cnn.com/2017/06/01/us/nasa-colorful-clouds/index.html
"Four to five minutes after launch, the rocket is expected to deploy 10 canisters about the size of soft drink cans, each containing a colored vapor that forms artificial, luminescent clouds. "
https://www.cnn.com/2017/06/01/us/nasa-colorful-clouds/index.html
"Four to five minutes after launch, the rocket is expected to deploy 10 canisters about the size of soft drink cans, each containing a colored vapor that forms artificial, luminescent clouds. "