Now that we are moving to Substrate Calculated Data sets based on paper white; how on earth do we communicate this to printers. Before OBA's we had GRACoL, Fogra47 - just to name a few. We would colour manage our proofs to GRACoL or Fogra47 (or some print specification), place an Idealliance colour bar on each proof and the customer/printer could measure the colour bar to see if we were in compliance or not to the particular specification. Now we start from GRACoL Uncoated 2013, change the Paper White values, create a new Data Set and proof to the new data set. Our colour bar on each proof now becomes useless as it will never match to the original GRACoL Uncoated 2013. How do we communicate this to a printer in Asia. How can they now trust our proofs. Do we give them a small single row Press Type Colour Bar that prints within the job itself and also give the printer the specs. for that colour bar. If so, what are the specs. of that colour bar (C,M,Y,K,R,G,B, grey balance swatches, etc). Data for that file would have to be colorimetric and not solid ink and dot gain values I'm guessing. Thanks Mike Stewart