Rubiadin glucoside (from madder), a sample chemical from Edward Schunck's research on natural dyes and plant products, 1840s-1900. Dye Sample; Rubiadin Scientific Instruments & Research
Diphenyl isatin, a sample chemical from Edward Schunck's research on natural dyes and plant products, 1840s-1900. Dye Sample; Diphenyl isatin Scientific Instruments & Research 1840s-1900
Bromo rubiadine, a sample chemical from Edward Schunck's research on natural dyes and plant products, 1840s-1900. Dye Sample; Bromo Rubiadine Scientific Instruments & Research
Oxime of m-chloroisatin, a sample chemical from Edward Schunck's research on natural dyes and plant products, 1840s-1900. Dye Sample; Oxime of m-chloroisatin Scientific Instruments & Research 1840s-1900