Workshop Technology
Sand wash is a casting defect which

Results in general enlargement of the casting
Occurs as sand patches on the upper surface of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in a mismatching of the top and bottom parts of a casting

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Workshop Technology
Riddle is used for

Reinforcement of sand in the top part of moulding box
Smoothing and cleaning out depressions in the mould
Moistening the sand around the edge before removing pattern
Cleaning the moulding sand

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