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If you know someone who ended up on the naughty list this year, a bag of yellow snow is the perfect gift. To sweeten the deal, however, this product comes with a science experiment you can do at home. Melt the powdered sulfur and watch it morph into different crystalline shapes before finally solidifying. Contains a cotton mueslin bag, two 1" lumps of sulfur, and a card directing you to our online experiment.