Historical information
"Dyeing with Coal Tar Dyestuffs - The Principles Involved and the Methods Employed" 4th ed. - C.M. Whittaker and C.C. Wilcock, 1946.
"Dyeing with Coal Tar Dyestuffs - The Principles Involved and the Methods Employed" 4th ed. - C.M. Whittaker and C.C. Wilcock, 1946.