Colorimetry as a tool for description of some wood species marketed as “tauari” in Brazilian Amazon

SANTOS, JOIELAN XIPAIA DOS; VIEIRA, HELENA CRISTINA; SOUZA, DEIVISON VENICIO; MUÑIZ, GRACIELA INÊS BOLZON DE; SOFFIATTI, PATRÍCIA; NISGOSKI, SILVANA

doi:10.1590/0001-3765202220191479

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FORESTRY SCIENCE • An. Acad. Bras. Ciênc. 94 (1) • 2022 • https://doi.org/10.1590/0001-3765202220191479 linkcopy

Colorimetry as a tool for description of some wood species marketed as “tauari” in Brazilian Amazon

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The aim of this study was to verify the potential of the colorimetric technique in the identification of some species marketed as “tauari” in the Brazilian Amazon. CIE L* a* b* parameters were applied to determine the colour of 35 wood samples from the main wood poles of the State of Para, Brazil, and the scientific collections of the Museu Paraense Emilio Goeldi (Walter A. Egler Collection) and Embrapa Amazônia Oriental. From each sample, data were obtained in the three wood surfaces: transversal, longitudinal tangential and longitudinal radial. The coordinate b*, which showed the yellow pigment, exerted greater weight in the color characterization of the 35 samples marketed as tauari, being more evident in the tangential and radial sections. In PCA, MGW wood samples showed considerably distinct color patterns in relation to PA and IAN samples, and the h and L* parameters provided better informations for distinguishing species from sample sources. The colorimetric technique can be used as an auxiliary tool in the identification of wood. However, the simultaneous use of colorimetry with the anatomical description of wood is suggested, given the complexity of the species-level separation in “tauari” group.

Key words
color parameters; Couratari; Lecythidaceae; wood discrimination

Species		L*		a*		b*		C*		h
Species	SN	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Couratarioblongifolia	126	64.57a	6.89	7.03a	1.65	23.27b	1.64	24.28b	1.61	74.45a	3.63
Couratari stellata	108	66.80a	5.79	7.28a	1.85	23.06ab	2.70	24.22ab	2.98	72.59a	3.17
Couratari guianensis	72	64.75a	10.45	6.96a	3.29	22.08a	3.31	23.35a	3.48	72.83a	7.49
Eschweilera sp.	18	69.41a	1.76	8.00a	0.98	26.23c	2.06	22.79ab	7.98	73.07a	1.32
Total	324

Species	Colorimetric parameters	Anatomical section
Species	Colorimetric parameters	Transversal	Tangential	Radial
Couratari oblongifolia [n = 42]	L*	62.01 a	67.85 b	67.92 b
	L*	(7.41)	(7.58)	(8.37)
	a*	7.45 a	7.51 a	8.03 a
	a*	(2.22)	(2.76)	(3.10)
	b*	22.62a	23.75 ab	24.54 b
	b*	(2.87)	(2.42)	(3.13)
	C*	23.91 a	25.01 ab	25.95 b
	C*	(2.97)	(2.94)	(3.61)
	h	71.80 a	72.79 a	72.24 a
	h	(5.02)	(4.78)	(5.50)
Couratari stellata [n=36]	L*	63.91 a	68.76 b	67.71 b
	L*	(5.01)	(4.15)	(6.83)
	a*	7.27 ab	6.68 a	7.87 b
	a*	(1.38)	(1.39)	(2.43)
	b*	21.95 a	22,68 a	24.55 b
	b*	(2.04)	(1.61)	(3.45)
	C*	23.16 a	23.67 a	25.83 b
	C*	(2.09)	(1.82)	(3.91)
	h	71.67 a	73.66 b	72.45 ab
	h	(3.24)	(2.55)	(3.40)
Couratari guianensis [n=24]	L*	64.45 a	65.91 a	63.88 a
	L*	(9.66)	(12.77)	(8.86)
	a*	5.77 a	7.33 a	7.77 a
	a*	(2.15)	(3.59)	(3.68)
	b*	21.44 a	23.14 a	21.65 a
	b*	(2.93)	(3.43)	(3.42)
	C*	22.37 a	24.52 a	23.16 a
	C*	(2.33)	(3.46)	(4.18)
	h	74.50 a	72.71 a	71.27 a
	h	(7.48)	(8.24)	(6.64)
Eschweilera sp. [n=6]	L*	67.92 a	69.76 ab	70.55 b
	L*	(1.47)	(0.30)	(1.97)
	a*	6.88 a	8.79 b	8.32 b
	a*	(0.56)	(0.40)	(0.66)
	b*	23.81 a	27.41 b	27.47 b
	b*	(1.24)	(1.11)	(1.05)
	C*	24.78 a	18.68 a	24.92 a
	C*	(1.33)	(10.53)	(8.59)
	h	73.89 a	72.19 a	73.13 a
	h	(0.64)	(0.96)	(1.67)

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[tfnI] L* = lightness; a* = chromatic coordinate axis green-red; b* = chromatic coordinate axis blue-yellow; C* = saturation or Chroma; h = hue angle; SN = sampling number for each specie. SD= standard deviation. Means with the same letter in column do not present statistical differences at 95% probability by Tukey test.