What I would have loved to do was do some real smithing, but, lacking a forge, anvil, and the ability to melt metal, we felt this project, combined with You Tubes of actual smiths, was good enough!
One kid at a time, each Zoomlian picked a can and drew a simple design on the outside with a water based marker. Gloves can be helpful here.
They then hammered a nail through the can (into the ice) to form a pattern of holes along their design. The key thing here is to rotate the can so that you are always hammering the nail straight down into the can.
Because the water had been in the can for several days, the dissolved air (which mixes in from the pressure in the water system) had dissipated, leaving the ice crystal clear. You can do this with ice cubes by boiling the water before putting it in the trays, and, indeed, the "solid" ice was slower to melt than our usual "cloudy" ice.
It wasn't actually this dark in the dining room!
By a happy coincidence, we ended up doing this craft on Candlemas (which you may call Groundhog Day), the traditional day for blessing candles!
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