The structure of real indigo, whether natural or synthetic, does not resemble a benzidine dye. It looks more like a two halves of an anthraquinone with double bonded oxygens and --NH2 groups on the para positions. And it certainly is not regulated as a benzidine. In the Colour Index it comes at the end of the very large anthraquinone class section with C.I. number being 73000 when synthetic and 75780 when it is natural.
From: Michael <mabuczynski**At_Symbol_Here**HOTMAIL.COM>
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Subject: Re: [DCHAS-L] Common industrial lab safety practices 1906-1930?
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And in 1936, the primary cancer may not have arisen in the liver. Research also the status of cancer research in 1936 to examine the assumption that the cancer was actually liver cancer.
From: Zack Mansdorf <mansdorfz**At_Symbol_Here**BELLSOUTH.NET>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Fri, Jun 9, 2017 7:04 pm
Sent: Friday, June 9, 2017 3:15 PM
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Subject: [DCHAS-L] Common industrial lab safety practices 1906-1930?
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