BS ISO 17972-4:2018 defines an exchange format for spectral measurement data of inks to provide a means to characterise spot colour inks to allow reliable printing and proofing of products that have been designed using these inks. Only isotropic (paper-like) substrates are within the scope of this document, which is limited to application areas where the same ink and paper combination that has been characterised is used when printing.This document describes the use of a CustomResource element within the CxF framework to define a minimum and recommended set of data for exchange.Cross References:ISO 17972-1:2015 ED1ISO 20654:2017ISO 17972-2ISO 17972-3ISO 12642-1ISO 13655ISO 12642-2All current amendments available at time of purchase are included with the purchase of this document.