Results 1 to 10 of about 79,741 (214)

Gemology, Mineralogy, and Coloration Mechanism of Pinkish-Purple Cobaltoan Dolomite from the Democratic Republic of Congo

Crystals, 2022
A pinkish-purple cobaltoan dolomite from the Democratic Republic of Congo (DRC) has appeared on the Chinese gemstone market recently. In this study, Raman analysis spectroscopy, Fourier transform infrared (FTIR) spectroscopy, electron probe micro ...
Ying Yan, Xiao-Yan Yu
doaj   +1 more source

Recent Advancements in Natural Plant Colorants Used for Hair Dye Applications: A Review

Molecules, 2022
There is an on-going demand in recent years for safer and “greener” hair coloring agents with the global consumer awareness of the adverse effects of synthetic hair dyes.
Hongyan Cui, Wenjing Xie, Zhongjie Hua, Lihua Cao, Ziyi Xiong, Ying Tang, Zhiqin Yuan   +6 more
doaj   +1 more source

Mineralogy Characteristics and Coloration Mechanism of Green Tourmaline in Tanzania

Yankuang ceshi, 2022
BACKGROUND There are differences in the production characteristics, chemical composition, coloration mechanism and formation conditions of green tourmaline from different producing areas.
TAO Longfeng, JIN Cuiling, ZHANG Qianshen, HAN Xiuli   +3 more
doaj   +1 more source

A Study on the Blue Coloration of Ao-ike Pond, Aomori Prefecture, Japan: Formulation of a Physical Model in Terms of Radiance and Image Analyses

Applied Sciences, 2021
The blue coloration model of a closed pond, Ao-ike Pond, Aomori Prefecture, Japan, was formulated in terms of radiance by applying a theory of observation devices proposed by Szirmay-Kalos (2008) and Hanaishi’s reverse ray tracing method.
Ryuji Hanaishi, Kazuhisa A. Chikita
doaj   +1 more source

Comparative Study on Gemmological Characteristics and Luminescence of Colorless and Yellow Scapolites

Crystals, 2023
The orange fluorescence of scapolite has been confirmed to be caused by (S2)−, but the frequent blue fluorescence in gem-quality scapolite has not been well explained.
Yinghua Rao, Qingfeng Guo, Sixue Zhang, Libing Liao   +3 more
doaj   +1 more source

Mechanisms of color constancy [PDF]

Journal of the Optical Society of America A, 1986
We develop a model of how the visual system finds the colors of objects that have unknown shapes and positions. The model relies on mechanisms of light adaptation, coupled with eye movements, to recover three descriptors of surface reflectance that are represented in the signals of an achromatic mechanism and two color-opponent mechanisms.
M, D'Zmura, P, Lennie
openaire   +2 more sources

Mechanism Underlying Color Variation in Calla Lily Spathes Based on Transcriptomic Analysis

Journal of the American Society for Horticultural Science, 2021
The calla lily (Zantedeschia hybrida) is a valued ornamental plant due to its unique shape and color variations. To determine the mechanisms responsible for color development in the calla lily spathe, we conducted a comparative transcriptomic analysis of
Ying Fang, Ting Lei, Yanmei Wu, Xuehua Jin   +3 more
doaj   +1 more source

Comparative Proteomics Analysis of Primulina serrulata Leaves Reveals New Insight into the Formation of White Veins

Horticulturae, 2023
Primulina serrulata is a valuable ornamental herb with rosette leaves and vibrant flowers. Some leaves of this species exhibit a bright and distinct white color along the upper veins, enhancing their ornamental value, while others are less white or ...
Quan-Li Dou, Da-Jun Xie, Tan Deng, Mo-Fang Chen, Zheng-Min Qian, Shuang-Shuang Wang, Ren-Bo Zhang   +6 more
doaj   +1 more source

Mineralogical Characteristics and Coloration Mechanism of Yellow-Green Alunite Jade

Yankuang ceshi, 2020
BACKGROUND As a new kind of jade, yellow-green alunite jade is difficult to positively identify and evaluate due to the lack of research. Yellow-green alunite jade is a new type of jade that has appeared on the market in recent years.
SONG Yan-jun, LI Gan-yu, ZHANG Jian, TAO Long-feng, LIU Yun-gui, ZHANG Lu   +5 more
doaj   +1 more source

Comparative Study on Gemological and Mineralogical Characteristics and Coloration Mechanism of Four Color Types of Fluorite

Crystals, 2023
Fluorite has been attracting the attention of gemstone mineralogists because of its rich color and excellent fluorescence properties. This paper studied fluorite with three color types (blue, green, and white) and five blue-purple fluorites with an ...
Yang Liu, Qingfeng Guo, Liangyu Liu, Sixue Zhang, Qingling Li, Libing Liao   +5 more
doaj   +1 more source