Better annealing is secured and harder metal may be annealed if the cooling
is extended over a number of hours by placing the work in a bed of
non-heat-conducting material, such as ashes, charred bone, asbestos fibre,
lime, sand or fire clay
Better annealing is secured and harder metal may be annealed if the cooling
is extended over a number of hours by placing the work in a bed of
non-heat-conducting material, such as ashes, charred bone, asbestos fibre,
lime, sand or fire clay. It should be well covered with the heat retaining
material and allowed to remain until cool. Cooling may be accomplished by
allowing the fire in an oven or furnace to die down and go out, leaving the
work inside the oven with all openings closed. The greater the time taken
for gradual cooling from the red heat, the more perfect will be the results
of the annealing.
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