Note: We conform to the colour profiles from ECI as far as these are available for the various classes of paper. In practice it has been proven that very high quality can be achieved by using these profiles that are based on ISO standard 12647-2. Therefore, these profiles should be used for making colour proofs and for colour conversion from RGB to CMYK (relative colorimetric rendering is recommended). A paper tint simulation has been included in the colour profiles. There may be considerable differences in paper tints in one paper class, particularly with LWC papers, however, and these can also show a different nuance in different proof systems.

The use of colour profiles does not guarantee that your proof will be exactly the same as our print result. It is therefore necessary to arrange to check and adjust the proof with us. (See the Guidelines for data and proof). It is also necessary that you place on every proof a FOGRA MediaWedge 3.0 / FOGRA Medienkeil 3.0 (www.fogra.org/mediawedge/index.html)
and an overprint check strip: pdf-overprint-expert.eps (www.globalgraphics.com) or OverPrintCheck.pdf (see page test designs) .

Look here for a detailed explanation of the different classes of paper and the application of colorprofiles Description of paperclasses