What a clever idea from Magicraft. This is about as clean and effective approach you can come up with to turn a candle into salt and no wonder it was a complete sell-out at Magi-Fest when it was first released in 1974. Maybe not mechanically clever, but you have to admire the solution for this effect ?
Magicraft Products was a small dealer and manufacturer founded by Tim Dereme in North Canton, Ohio c. 1966. As far as I can tell they were in business until c. 2004.
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