This deliverable is for task 4 in WP8, the Digital Documentation Research Work Package, is of the nature of a demonstrator. Therefore the main deliverables are the two digital research resources available for open access on the web (see URLs below) and one working resource for internal collaborative project use (see description below) rather than this document. The web resource should be accessed through a Google Chrome browser for the best experience. This document lays out the principles and some main points about the work carried out in constructing these research resources during the period since the last deliverable. Digital resource 1: The database of preparation layers in sixteenth-century Italian paintings is now available at https://research.ng-london.org.uk/iperion/. Digital resource 2: a beta version of an extended database of preparation layers in paintings that includes northern European seventeenth-century paintings and Italian seventeenth-century paintings in addition to those from Italian sixteenth-century paintings is available at https://research.ng-london.org.uk/iperion-tmp/. A working resource for internal collaborative project use is also presented, as is its application for a digital sampling point system at the National Gallery, and for documenting points of interest for a technical examination at the British Museum. It is intended to continue to use and to expand the content of these databases and resources in the future. The structures underlying the research resource are also re-usable, in that they can form a suitable template for research resources on completely different subjects. The intention is that after the end of IPERION-CH, some further work will be undertaken to make the code suitable for inclusion on GitHub and therefore accessible for use in the future. With contributions from: Joseph Padfield, Marta Melchiorre, Joanna Russell, Cristina Giancristofaro, Jørgen Wadum, David Buti, Anna Vila, Johanne Nielsen, Astrid Grinder-Hansen, Nora Schlag, Heike Stege, Jeanine Walcher, Maite Jover de Celis, María Dolores Gayo García, Wim Fremout, Magdalena Iwanicka, Mikkel Scharff

Further project details can be found at: http://www.iperionch.eu/ and https://cordis.europa.eu/project/id/654028