article_snippet: It also used so-called Fourier Transform InfraRed (FTIR) residue analysis to identify organic residue.
article_snippet: FTIR uses infrared to identify bio-signatures of prehistoric compounds.
article_snippet: The team also used so-called Fourier Transform fraRed (FTIR) residue analysis to identify organic residue .
highlights_snippet: These are processes that determine function and identify organic residue .
  