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The way in which light is absorbed or reflected by a crystalline material is determined by the structure of the crystal. This crystal structure can be changed by the application of heat. In some cases this change is reversible and the original structure, and therefore the original color, returns upon cooling. Two compounds are formed when metal salts are reacted with the [HgI4]2- Ion. Each compound is heated on a hot plate and a change in color is noted. The initial color of the compound returns upon cooling.

Kit Includes:
3 x 25g Mercury (II) Chloride
3 x 25g Potassium Iodide
1 x 15g Silver Nitrate
2 x 25g Copper (II) Chloride, Anhydrous

DOT Info:
Small quantity exemption 173.4
THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only

 WARNING: This product can expose you to chemicals including Mercury/mercury compounds, which are known to the State of California to cause reproductive harm. For more information go to

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