Grow sparkling, colourful crystals overnight from a safe solution of potassium aluminium sulfate. Single out the largest crystal shard, redissolve the remaining crystals, and repeat the crystal formation process to grow a larger, more striking crystal. This kit includes four packets of crystal-growing salt and two dyes (red and blue) so you can grow a variety of crystals in different sizes and colours.
Recommended age: Ages 8+
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