Vibrational and Compositional Analysis Associated with the Color of Guadua angustifolia Kunth Variety Bicolor (GAKVB)

Table 1

Raman peaks in the exterior wall of GAKVB identified by compound, wavenumber, and reference.

Number	Wavenumber (cm^−1) GAKVB	Wavenumber (cm^−1)	References	Color	Compound
1	238.89	240		Yellow ochre	Fe2O3·H2O + silica, goethite
	1217.39	1218	[24]	Indian yellow	MgC19H16O11·5H2O
	1598.77	1599		Indian yellow	MgC19H16O11·5H2O
2	238.89	239	[25]	Blue	Al2SiO3
3	379.49; 440.6	378; 432	[26, 27]	Blue	Al2O3
4	379.49	383	[28]	Yellow ochre	FeO(OH)𝑋·H2O; FeO1−𝑋(OH)1−2𝑋·H2O (0<𝑋<0.5)
5	394; 887.8	391; 890	[29]		Al2SiO5
6	394.29	393-392	[30]		Fe–O–Fe/–OH goethite
7	904.6	907	[31]	Brown	γ-Fe2O3
8	1598.77	1598	[32]		LADH/NADH/N-cyclohexylformamide
9	2099.12	2102	[33, 34]	Prussian blue	Fe[Fe(CN)6]3·4H20