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Old organic type liquids often lost their color due to influence of (UV) daylight, not all are fluorescent.

Here are some color examples: Quinine, a light yellow fluid - bright blue fluorescent, Fluorescein - yellow fluid, bright yellow green Rosaniline - magenta fluid Magdala red or Sudan red - red fluid.

Platinum wire was used due to the similar expanding coefficient as the glass.

The early tubes were made of soft soda lime glass, there were differences in composition (impurities) due to their local origin. There were many glass sorts like Crystal, Kali, Duran and Berliner glass.

For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit.

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