1. The document provides resources for researching techniques and materials used by artists, including books, databases, and image archives. 2. It discusses researching panel painting techniques through analyzing how Renaissance artists built up paint layers on wood panels. Investigating conservation efforts can also reveal artistic processes. 3. Key search terms are provided for exploring Northern Renaissance oil painting techniques, as well as researching specific artists like Rogier van der Weyden through their works and workshop practices. Reference books on artists' materials and techniques are also listed.