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

News & Upcoming Events


  • The IRUG14 Conference at The Cultural Heritage Agency of the Netherlands, Amersfoort (RCE) was tentatively rescheduled to May 19-21, 2021 (from May 27-29, 2020) due to the COVID19 pandemic.

  • At the time, we hoped a one-year postponement would get us beyond the crisis. However, until we can be assured that travel & gatherings are safe, the May 19-21, 2021 conference date will remain tentative. Thus, we are advising all conference participants to wait for further notice before booking airline tickets & accommodations.

  • If possible, please keep the May 19-21, 2021 date open for now.

  • We understand the inconvenience caused by this uncertainty, & thank you for your patience. We will continue to provide updates as the situation unfolds.

  • Please direct all inquiries and correspondence to

  • We sincerely appreciate your participation in IRUG and wish everyone well.

P. Andrew Lins (1945-2019): Remembering a Dear Colleague with Gratitude

IRUG pays tribute to the life of Andrew Lins, the former chair of the Conservation Department at the Philadelphia Museum of Art, who passed away on Christmas Day, 2019, at the age of 74. 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 the incorporation of IRUG in the early 1990s. He firmly believed in the IRUG mission of collaboration in the pursuit of accessible, high-quality reference data among institutions. Andrew was an unwavering advocate of IRUG throughout our existence. His continued support greatly helped to propel IRUG on an international level. With fond memories, we will always be grateful for his guidance and friendship.

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