Infrared & Raman Users Group

IRUG is a community that encourages the sharing of high quality comparative reference spectral data.

We develop IR and Raman reference spectra for the study of works of art, architecture, and archaeological materials. Our database is peer-reviewed through a rigorous process facilitated by this website.

Anyone may search the database to view and print spectra. To access digital spectra and related information, you must join IRUG and contribute spectra. Click the button below to begin registration.


Featured Spectra

Upcoming Virtual Event!


The Infrared & Raman Users Group (IRUG) & Cultural Heritage Agency of the Netherlands (RCE) are pleased to announce that the IRUG14 Conference, in honor of P. Andrew Lins (1945-2019), will be a virtual event this year.

Date & Time: Wednesday, June 2 to Friday, June 4, 2021, with half-day sessions from 14.00 to 18.30 CET/CEST (8:00 am - 12:30 pm ET).

Topics: Diverse aspects of infrared & Raman spectroscopy for the study, documentation, & protection of the world’s cultural heritage.

Registration: Free of charge. To register click here: REGISTRATION.

Program: To view click here: PROVISIONAL PROGRAM.

Inquiries: Please address inquiries to Suzan de Groot,

We look forward to connecting with our many colleagues around the world for an enjoyable and informative event!

P. Andrew Lins (1945-2019): Remembering an Outstanding Colleague

IRUG pays tribute to the life of Andrew Lins, former chair of the Philadelphia Museum of Art, Conservation Department, who passed away on Christmas Day, 2019. Andrew was a highly accomplished conservator, scientist and renowned expert on metals and corrosion. His rich life and many accomplishments have been well-recognized. Less known is the importance of Andrew's early leadership that made possible IRUG's incorporation in the early 1990s. He firmly believed in the Group's mission of collaboration in the pursuit of accessible, high-quality reference data among institutions. Andrew was an unwavering advocate throughout IRUG's existence. His continued support greatly helped to propel IRUG on an international level. With fond memories, we always will be grateful for his guidance and friendship.

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