Why is everything in bold with use the following xslt

I only want the date to be in bold, but somehow the whole list is in bold. How do I change this?

   <ul> <xsl:for-each select="object">
             <xsl:sort select="emuIRN"/>

          <li>
              <xsl:value-of select="emuIRN"/>
              <xsl:text>, </xsl:text> 

                  <b>
                      <xsl:value-of select="date_made"/> 
                  </b>


              <xsl:for-each select="materials">
                  <xsl:value-of select="material"/> 
                  <xsl:text>, </xsl:text>
              </xsl:for-each>

          </li>               

   </xsl:for-each>

   </ul>