The Archangel Report says the museum features artworks and relics of saints and others who are alleged to have returned from Purgatory to warn the living to repent.
The damaged work is a canvas painting of the souls in Purgatory being assisted by angels.
The fire has also resulted in scorched fingerprints on prayer books, as well as singed clothes and burnt wood.
Purgatory fire burns is uncomfortable message at Purgatory Museum (The Archangel, 26/8/07)
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