Colorability of Wood Material with Punica granatum and Morus nigra Extracts

Abstract

The aim of this study was the development of an eco-friendly dye that may be used in furniture, woodworking, and upper surface treatment, with no ill effects to human health. The plant dyestuff was extracted from pomegranate skin (Punica granatum) and black mulberry (Morus nigra) using an ultrasonic method at different rates. The extraction percentage ratios were, by weight in distilled water, 25%, 30%, 35%, 40%, 45%, and 50% and were applied to Scotch pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis L.) through an immersion method. After that, the determination of color change under the accelerated weathering conditions and the feasibility as the upper surface stain of this dyestuff were studied. The values of total color change of the natural dye samples that were applied to the test material were determined after accelerated weathering processes lasting 50, 100, and 150 h, according to ISO 2470. The results showed the best color stability in Oriental beech wood that was treated with 30% pomegranate skin or black mulberry extract as well as Scotch pine wood that was treated with 25% pomegranate skin extract or 50% black mulberry extract. Exactly the same ΔE* values were obtained with the same dyestuff and same wood type, indicating close color stability behaviors. According to the results, both pomegranate skin (Punica granatum) and black mulberry (Morus nigra) can be used to color wood materials.

Natural coloration of wood material by red beetroot (Beta vulgaris) and determination color stability under UV exposure

“…According to the results, all wood specimens exposed to UV radiation of 350 nm for all the exposure periods generally showed negative values of ∆L*. This was attributed to chemical changes which occurred, especially in lignin, due to photo-degradation resulting from UV exposure and, consequently, to a darkening of color on the wood (Peker et al 2012, Ozen et al 2014. The high negative values of ∆L* indicate the sensitivity of that wood type against UV radiation and the surface quality thereof (Feist and Hon 1984).…”

One-Step Deposition of Polyester/TiO2 Coatings by Atmospheric Pressure Plasma Jet on Wood Surfaces for UV and Moisture Protection

“…where ∆ means the difference between the indicated final and initial parameters after UV irradiation [32]. A low ∆E* value corresponds to a small colour change and indicates that the samples are less sensitive to UV radiation [33]. The water contact angle (WCA) was measured to evaluate the wettability of the uncoated and coated wood samples using a Mobile Surface Analyzer-MSA (Krüss GmbH, Hamburg, Germany).…”

Deposition of TiO2 Thin Films on Wood Substrate by an Air Atmospheric Pressure Plasma Jet

“…where ∆ means the difference between the indicated final and initial parameters after UV irradiation [28][29][30]. A low ∆E* value means a small loss of colour and indicates that the specimens have a high resistance to damaging UV radiation.…”