Coins using Potassium Chlorate

A chemistry teacher writes as follows about his experiences when experimenting with potassium chlorate  

Once at the beginning of my service as a chemistry teacher I mixed I thought very carefully potassium chlorate and phosphorus with the aid of a horn spoon. For three days my ears were ringing. The open dish was shattered, the shards had penetrated the desk, and despite a zealous search absolutely nothing was to be found of the horn spoon except the handel, which was in my hand. 

Prior to the introduction of coins most of the ancient people used metal rings, bars or other forms for payment. Thus Agatharchides reports  

The first coins were minted about 600 B.C. in the Greek cities of western Asia Minor at that time these were subject to the Lydians, who are thus considered to be the discoverers of coins. 

Flat iron block, aluminum sheet (0.1-0.3 mm thick), coin, 25-mL Erlenmeyer flask, dropping pipette, tweezers, filter paper, safety glasses, protective gloves. 

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