Anyone do the "Make Stalactites" experiement?

Have you tried the experiment where you make your own stalagmites and stalactites out of baking soda or epson salt? We tried this with epson salts, and after three weeks half the water had soaked into the yarn and crsytalized there (turned it hard) but we got no stalactite growth. Has anyone tried this? Does the baking powder ones go quicker? If you did get the epson salt ones to grow how long did it take?

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