That
would be fun. I wonder how much of a vacuum you'd have to draw to be effective? A 2' length of 3" rigid conduit with a threaded end cap on both ends, one of them drilled for an air fitting+valve of some sort would probably be enough of a dyeing vessel and could probably be made for $20 or so. Just need the appropriate vacuum pump. One of these...
... is only
$89 at Harbor Freight. Draws down to 75 microns. I don't know what that means, but it sounds serious.