UV/Visible spectrum of old glassine and Canson tracing Paper. Notice the shift in transmittance at approximately 650 nm in both specimens. This leads me to believe that these two papers are essentially the same. The greater transmittance of the old glassine is likely due to some decomposition of the paper over time.
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Jäsenen eastonlionel lataama kuva (Apr 15, 2013).