CHEMISTRY
'(<a href="http://www.j-archive.com/media/2008-05-30_DJ_18.jpg" target="_blank">Sarah of the Clue Crew reports from the <i>Jeopardy!</i> lab.</a>) The juice from blackberries can make ordinary construction paper into <a href="http://www.j-archive.com/media/2008-05-30_DJ_18a.jpg" target="_blank">this</a> "testing" type of scientific paper'
litmus paper