How to Grow a Big Alum Crystal - Simulated Diamonds: Alum crystals grow overnight into beautiful diamond-like jewels.
Grow a Synthetic Ruby Crystal: This is a crystal of potassium alum or potash alum. Food coloring was added to these crystals, which are clear when the alum is pure.
How to Grow Ruby Potassium Alum Crystals
Grow Purple Chromium Alum Crystals in This Cool Chemistry Experiment: This is a crystal of chrome alum, also known as chromium alum. The crystal displays the characteristic purple color and octohedral shape.
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Alum crystals are probably the easiest crystals to grow. From the spice section of your pantry.
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