SCIENCE CLASS
'(<a href="http://www.j-archive.com/media/2008-01-02_DJ_12.jpg" target="_blank">Sarah of the Clue Crew gives the clue.</a>) We've rubbed the pigment of a radish on these cards; <a href="http://www.j-archive.com/media/2008-01-02_DJ_12a.jpg" target="_blank">lemon juice</a> turns the pigment orange, indicating that it's an acid; <a href="http://www.j-archive.com/media/2008-01-02_DJ_12b.jpg" target="_blank">milk of magnesia</a> turns it blue, indicating that it's this'
a base