The shiny barium in the tube on the left indicates that the vacuum is still intact.
Vaughan Woodruff
A barium getter coating is used to sustain the vacuum in an evacuated tube and can identify tubes that have lost their vacuum. The shiny barium in the tube on the left indicates that the vacuum is still intact. The getter in the tube on the right has turned white, indicating that it has been fully exhausted and that the vacuum has failed.
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