Are you talking about the blue liquid that's under the gauntlet?
Then you just need to get clear casting resin. You can get this at Micheal or Tap. Coloring it is easy. After getting the resin and hardener mixed, then add your dye to the mix and quickly dump it where you need it to be.
But it would be cool if it were a liquid. You just need to seal it in a vial and that would be that.
When in doubt, just take the next small step.
With that next step take a deep breath. It calms the mind.
When the mind is calm you realize the best is still yet to come.