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From "Perplexity" on Google - So, your green glass going colorless under UV light suggests it is likely a vintage manganese-containing glass or possibly a specific type of uranium glass or other additive combination with unique fluorescence or photochromic properties. It is not the typical uranium glass green glow but rather a color change behavior due to light interaction with its chemical composition.
Based on your description, manganese or similar additives are likely involved in the UV color change behavior you observe.