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.