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The mysterious blue-purple artifact you're referring to could be the Tyrian Purple dye, an incredibly rare and valuable substance from ancient times.
Recently, archaeologists working in England unearthed a "mysterious lump" of this purple substance at a Roman site.
Tyrian Purple is made from thousands of crushed seashells from the Mediterranean, North Africa, and Morocco, and was phenomenally difficult to make and expensive to produce.
It's a testament to the wealth and power of the elite class during Roman times, as Tyrian Purple was reserved for the highest echelons of society.