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Authentic sea glass is an incredibly sought-after, highly expensive craft material. Finding beautifully frosted, perfectly smooth, massive chunks of rare cobalt blue or deep emerald glass washed up on a beach requires extreme geographical luck and hundreds of hours of walking.
However, sea glass is nothing more than sharp glass garbage (like a broken beer bottle) that has been violently smashed, chemically etched by saltwater, and aggressively tumbled against abrasive sand for thirty years.
You do not need thirty years. If you own a massive collection of terribly colored, clear, green, or blue empty wine bottles, you can physically replicate the exact violent, abrasive oceanic process in a matter of days using a cheap electric machine. Here is the aggressive structural blueprint for manufacturing faux sea glass at home.