The purpose for dropping out specific colors is to allow the OCR scanner to ignore those colors and operate only on the foreground information.
Drop out ink is often used in the finance industry for automated paper invoice processing.
Drop out ink is NOT the same as inks that have been screened down.
Alarm over drop-out rates ; Making the transition from the Leaving Cert to third-level can be difficult and demanding, writes Sean Flynn, Education Editor
Aug 14, 2002; After the relief of finally getting the Leaving Cert results today, most students probably think it is all downhill from here....