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Lifting

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Lifting presents as a wobbly leather-like surface and is typically the second stage of a buckling defect. This indicates that the sides of the pyramid cracked and prewet and/or slurry trapped in the shell has seeped through the cracks and filled the shell cavity. 

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The causes of this defect are evident in the wax and shell portions of the process. To cure these causes, R&R recommends taking the following actions.