Used them for bottling homemade moonshine. Thought it would be cool to give people a fun cap. The caps work fine. However, the color change was not as dramatic as in the photo. It changes from white to slightly blue and technically you can see the whole picture at all times. Maybe if I put them deep in an ice bath for a few days instead of just in the fridge? Overall excellent bang for the buck, they've been working. Just not as dramatic color change as I would like.
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