Paper Shade I
Technical Update of the standard measuring method to determine the LWC paper shade for gravure printing

METHOD
An expert group representing paper manufacturers, gravure printers, ERA and the German Printing and Media Industries Federation (bvdm) has been working to update the standard measuring method to determine paper shade. This was necessary because of a new measuring generation of instruments (Elrepho 3000 and similar devices) and the increasing utilisation of optical brighteners.

As a new standard measuring method, the following was defined:

Device:

Spectrophotometer according to ISO 2469, Annex A

Conditions:

instrumentation opening 24mm; calibrated UV stimulus

Calibration:

a) against a dark body
b) against absolute white, traceable back to ISO/TC 6 - level 1
c)against UV standard ISO level 3 according to ISO 11457

Light source:

D35/10°