Colorimetría en la madera de Prosopis alba

Cisneros, Ana Belén; Nisgoski, Silvana; Moglia, Juana Graciela; Córdoba, Mariano

doi:10.4067/s0718-221x2019005000311

Cited by 3 publications

(5 citation statements)

References 8 publications

(17 reference statements)

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“…The light colour of marupa wood is explained by the high L* values of 82,83 the marked presence of yellow pigment (b* 22,72) and low presence of the red pigment (a* 3,51). Similar behavior of L* variation in relation to yellow and red pigments was correlated in a work by Cisneros et al (2019) in analyzing Prosopis alba wood. The high h* value of 81,23 positions the colour of this wood near the b* axis, confirming the great influence of the b* coordinate on the colour characterization of the studied wood.…”

Section: Colorimetrysupporting

confidence: 77%

Effect of applying finishing products and sanding on the surface of marupa wood

Paula¹,

Mesquita²,

Costa³

et al. 2020

Maderas, Cienc. tecnol.

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The effect of applying cetol and finishing varnish products and sanding on the surface roughness and colour of marupa (Simarouba amara) wood was evaluated. Three coats of each product were applied and two sandpaper grits were used, 280 and 320). The analyzes were performed on untreated samples and between each coat of products in order to analyze the effect of sanding, the products and the number of coats. According to colorimetry, the L* value for the control treatment was 82,83 and the treatments reduced the L* to 61,70 on average for the cetol treatment and 77,09 for the varnish treatment, showing that the cetol darkened the wood more than the varnish. The yellowish and reddish pigmentations became more intense according to the positive values of Δa* and Δb*, especially after applying the cetol. The total colour variation ΔE average was 40,79 for the cetol treatment and 9,83 for the varnish treatment, confirming a much more significant colour change in the cetol treatment. Sanding with different grits did not significantly alter the surface colour. The product application made the wood surface smoother, and was noticeable from the second coat. Sanding reduced roughness on the wood surface, but the finishing product was the largest source of variation.

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Section: Colorimetrysupporting

confidence: 77%

Effect of applying finishing products and sanding on the surface of marupa wood

Paula¹,

Mesquita²,

Costa³

et al. 2020

Maderas, Cienc. tecnol.

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“…Differences between heartwood and sapwood have been described in other species related to growing conditions. In Prosopis alba, Cisneros et al (2019) found a distinction between and inside trees and observed darker heartwood at sites with more precipitation. Sotelo Montes et al (2013) also described the influence of environment on wood color.…”

Section: Discussionmentioning

confidence: 90%

“…These results corroborate literature that describe variation in colorimetric parameters from transversal to radial or tangential sections in native forest, as Vieira et al (2019) which reported a tendency of parameter b* to be smaller in transversal sections in some Myrtaceae species and verified the influence of each species. Evaluating wood from different sites, native and planted forest, of Prosopis alba Griseb, Cisneros et al (2019) reported that transversal sections were darker in heartwood while in sapwood there were no differences among sections.…”

Section: Discussionmentioning

confidence: 99%

“…The literature contains descriptions of color parameters in some Brazilian species (Silva et al 2017;Vieira et al 2019), comparison of color parameters between sites in native and planted forest (Sotelo-Montes et al 2013;Cisneros et al 2019), for example. In wood industries, grades for heartwood color and color variations can be assigned using colorimetry to identify market preferences.…”

Section: Introductionmentioning

confidence: 99%

“…Rodriguésia 72: e00962020. 2021 et al 2019) and in the same species comparing natural and planted forests (Cisneros et al 2019). The knowledge of variation in color parameters from each species is important to standard applications, for example, the cut of boards in radial or tangential direction can produce lots of wood more homogenous in color, in accordance with market preferences (Atayde et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Colorimetry of Acacia mangium wood from plantations in northeast Brazil

et al. 2021

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The aim of this study was to evaluate color characteristics in wood samples from Acacia mangium from a homogeneous plantation in Bahia state, northeast Brazil, and also analyze the influence of anatomical section and radial position in the trunk on color response to contribute to information for the best use of the wood, such as, for example, the optimization of the performance of the pieces in sawmill through the most acceptable aesthetic form by the final consumer. Six trees with age of 14 years were cut. The species was identified by anatomical analysis at the Laboratory of Wood Anatomy of the Federal University of Paraná, comparing the sample collected with the authenticated material. A disc from the base of each tree was divided into six samples oriented in anatomical sections (transversal, radial and tangential), with dimensions of 20 × 20 × 30mm, named near pith, intermediate and near bark. A total of 36 samples were evaluated, 12 from each position. The colorimetric evaluation was performed with a CM-5 spectrophotometer. Data on lightness, green-red and blue-yellow chromatic coordinates were obtained, and values of saturation and hue angle were calculated. Acacia wood from planted forest is classified as olive color. Color parameters were influenced by anatomical section and radial position in the trunk, being found 44 for the transversal section, 55 for the tangential section and 57 in the radial for luminosity. Transversal sections had lower values in comparison to longitudinal surfaces and radial sections had higher luminosity than tangential sections. The near bark region presented lower values in most colorimetric parameters, except hue angle, in comparison with the intermediate and near pith regions, which was around 70 in the different positions of the wood.

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