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, & we 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.

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