With the Colour-Override module, you can isolate some colours in your drawing and render those ones only.
To render selected colours:
|1.||From the Colours section, drag the colour swatches to render and drop them into the Render Selected Colours section.
You have to enable the Render Selected Colours option for the module to proceed with the operation.
|•||Colour-Override Editor Interface|
|•||Overriding a Colour|