Define pattern colour code, Mechanical Engineering

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Q. Define pattern colour code?

The patterns are normally painted with contrasting colours such that the mould maker would be able to understand the functions clearly. The colour code used is

Red or orange on surfaces not to be finished and left as cast
Yellow on surfaces to be machined.
Black on core prints for unmachined openings.
Yellow stripes on black on core prints for machined openings.
5 Green on seats of and for loose pieces and loose core prints.
Diagonal black stripes with clear varnish on to strengthen the weak patterns or to shorten a casting.

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