• A carcinogenic yellowish, white, or reddish-gray crystalline powder, C<sub>12</sub>H<sub>12</sub> N<sub>2</sub>, that is a derivative of biphenyl, is used in dyes, and is used to detect blood stains and cyanide.
  • The common name for para-diaminodiphenyl, one of the aromatic bases having the formula NH<sub>2</sub>.C<sub>6</sub>H<sub>4</sub>–C<sub>6</sub>H<sub>4</sub>.NH<sub>2</sub>. It is an important raw material in the preparation of many of the direct cotton colors.
  • The <xref>aromatic</xref> <xref>diamine</xref> 4,4'-diaminobiphenyl that is used in testing for <xref>cyanide</xref>, and for traces of <xref>blood</xref>
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