another metal, or a coated material.
A magnet can sometimes help determine whether they are ferromagnetic, but magnetic behavior alone will not identify the object.
Avoid scratching, cutting, or breaking the tube to test the contents.
Any markings or labels
Check carefully for:
Numbers
Letters
Manufacturer names
Logos
Measurement marks
Arrows or directional symbols
Patent or model numbers
Even a small marking can be useful when researching an old component.
How to Investigate an Unfamiliar Glass Tube Safely
If you have found the object among old household items, take a few precautions before handling it extensively.
Inspect it visually first.
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