A wax model made from the Gloucester Candlestick in preparation for a sample casting

A wax model made from the Gloucester Candlestick in preparation for a sample casting

The wax models were then covered in a material that was resistant to heat, such as clay (known as the investment). This material surrounded the wax protecting its shape. Once the investment had hardened, the wax was melted out and the metal was then poured into the mould, taking the shape of the original wax model. In the case of the Gloucester candlestick where the wax was carved in openwork there was no need for core pins to secure the two investment materials together. There would be no chance for the core to shift as it would make direct contact with the outer mould in places were there is open work. Generally the core was removed after the casting, but can still be found in some pieces. There is no evidence of any investment material on the candlestick.