Benzopurpurine 1B dye sample
1920 circa
1920 circa
1840s-1900
1920 circa
circa 1980
circa 1980
circa 1980
circa 1980
circa 1980
circa 1980
circa 1980
circa 1980
circa 1980
circa 1923
circa 1980
circa 1980
circa 1980
circa 1980
1920 circa
1920 circa
1920 circa
circa 1890
circa 1890
circa 1890
circa 1890
circa 1890
circa 1890
1920 circa