Introduction
The initial draft of ISO 2846-2 was prepared by ISO/TC 130 for materials an d process control. They examined
the colorimetric properties of commercial coldset web offset inks from around the world and found that a single
set of colour coordinates could adequately represent these, within reasonable tolerances. Si nce the initial
publication of this part of ISO 2846, additional co ordination between the var io us national bodies participating
in ISO/TC 130 has suggested that some minor refinements of the colorimetric aims would make them more
compatible with actual commercial printing requirements and to the process standard ISO 12647-3 [1].
This part of ISO 2846 will allow printers to obtain sets of process inks from variou s sources which will produce
a similar colour when printed on the refer ence substrate at the appropriate film thickness. This will allow colour
separations for coldset web offset printing to be based on known colour standards. The colorimetric
characteristics specified in this part of ISO 2846 may only be obtained when the inks ar e printed on the
reference substrate. However, similarity of two inks on the reference substrate will ensure similarity on another
substrate.