After the molds are filled with bronze, they quickly start to cool and the bronze turns from red molten to black as depicted. The molds cool upright as in the photo, for about 30 minutes. Then, the molds are removed from the rack and placed in a tub of cool water. As the molds are added, the water steams and hisses and sometimes boils. Cool water is constantly added and the molds begin to crack open. The molds are left in the tub until the water becomes tepid. This takes about another 15-20 minutes.
After the molds are filled with bronze, they quickly start to cool and the bronze turns from red molten to black as depicted. The molds cool upright as in the photo, for about 30 minutes. Then, the molds are removed from the rack and placed in a tub of cool water. As the molds are added, the water steams and hisses and sometimes boils. Cool water is constantly added and the molds begin to crack open. The molds are left in the tub until the water becomes tepid. This takes about another 15-20 minutes.
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