Figure 6

Partial enlargement of the 2nd spectra of anthraquinones. There were significant differences of anthraquinones at 1371–1470, 1620–1838, 1976–2020, and 2094–2200 nm.
Partial enlargement of the 2nd spectra of anthraquinones. There were significant differences of anthraquinones at 1371–1470, 1620–1838, 1976–2020, and 2094–2200 nm.