Patterns are usually made of wood and finished with smooth painted surfaces. In addition to providing a smooth finished surface that allows the pattern to be removed from the mold, the paint is used to identify the different part of the pattern (pattern, core prints, surfaces to be milled). The American Foundryman's Society has adopted the following colour codes for painting patterns.
Nonferrous
Pattern - yellow
Coreprint - black
Machined areas - red
Loose piece mating areas - yellow with red strips
Gating for mounted patterns - yellow
Ferrous
Pattern - black
Coreprint - yellow
Machined areas - red
Loose piece mating areas - yellow
Gating for mounted patterns - yellow
There are other colours for other types of metals.
Next up: Making sand cores using Sodium Silicate and Carbon Dioxide (CO2)
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