Exploratory investigation of color changes in paints induced by broadband synchrotron radiation

1996 ◽  
Vol 74 (5-6) ◽  
pp. 244-250 ◽  
Author(s):  
A. D. O. Bawagan ◽  
M. Sabaye-Moghaddam ◽  
K. H. Tan ◽  
B. W. Yates
Keyword(s):  
Synchrotron Radiation ◽  
Diffuse Reflectance ◽  
Broad Band ◽  
Color Changes ◽  
Exploratory Investigation ◽  
Color Differences ◽  
Before And After ◽  
Coated Surfaces ◽  
Aluminum Surfaces ◽  
Reflectance Measurements

Changes in color of coated (painted) aluminum surfaces exposed to broad-band synchrotron radiation (10–2000 eV) are investigated as a function of radiation dose (N). Quantitative color differences [Formula: see text] before and after exposure are obtained from spectral diffuse reflectance measurements using the standard CIELAB formula. The results indicate that the dose–response curve of the color-coated surfaces at large photon doses can be described as [Formula: see text] where d is a material-dependent constant.

Investigation of the effect of light fastness on the color changes of maps prepared by electrophotographic digital printing

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Zafer Özomay ◽  
Çağla Koşak Söz ◽  
Sinan Sönmez
Keyword(s):  
The Other ◽  
Digital Printing ◽  
Light Fastness ◽  
Color Changes ◽  
Before And After ◽  
Printing System ◽  
Different Color ◽  
Coated Surfaces ◽  
Electrophotographic Printing ◽  
Effect Of Light

Abstract In this study the prints were made on paper substrates, which were thought as map substrate alternatives, with 3 different surface properties at 1200 dpi by using the electrophotographic printing system. Color and gloss values of the samples were determined both before and after exposure to light for a period of 42 hours to determine the light fastness of the substrate and the print on it. The studies revealed that after the light fastness tests (i) the width of the color universe of the papers with matte surfaces is more than that of the papers with glossy surfaces, (ii) the loss of brightness of woodfree paper is higher than that of the other paper samples and (iii) the print chroma values obtained in woodfree paper is lower than those of the coated surfaces. Moreover, (iv) the delta E 00 {E_{00}} measurements revealed that all paper samples experienced different color losses in different colors, and the most significant differences in these color losses were in magenta and black.

Effect of Bleaching on Color Change of Stained Resin Composites

2017 ◽  
Vol 751 ◽  
pp. 636-642
Author(s):  
Ratcha Raksakmanut ◽  
Ampaporn Nithipratheep ◽  
Ornjira Weeriyanan ◽  
Panida Pittayaporn ◽  
Waivich Komonpale ◽  
...  
Keyword(s):  
Red Wine ◽  
Color Change ◽  
Artificial Saliva ◽  
Resin Composites ◽  
Carbamide Peroxide ◽  
Spectrophotometric Measurement ◽  
Bleaching Process ◽  
Color Changes ◽  
Color Differences ◽  
Before And After

The aim of this study was to evaluate the effects of bleaching on color change of stained resin composites. Ninety disk-shaped specimens were prepared with 3 different composite materials (Estelite ∑ Quick, Premise, and Filtek Z350 XT). After stored in artificial saliva at 37°C for 24 hours in an incubator, the 30 specimens of each material were divided into 3 subgroups and immersed in either coffee, red wine, or artificial saliva (control) at 37°C. After 24 days, spectrophotometric measurement was performed. After the staining process, the bleaching agent (Opalescence, 10% carbamide peroxide) was applied to the surface of the specimens, 8 hours per day for 14 days. After the bleaching process, spectrophotometric measurement was performed. The color differences between specimens before and after bleaching were statistically significant (ΔE*ab>3.3) for all composites in the red wine staining. The highest-level color change after bleaching was observed for Filtek Z350 XT in red wine staining, while the least value was found in Estelite ∑ Quick in coffee staining. In summary, color changes of all red wine-stained composites after bleaching were noticeable and have higher level of color change than coffee-stained composites.

scholarly journals Molecularly imprinted electrospun fiber membrane for colorimetric detection of hexanoic acid

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 500-510
Author(s):  
Xiaoguang Ying ◽  
Jieyuan He ◽  
Xiao Li
Keyword(s):  
Low Cost ◽  
Electrospun Fiber ◽  
Colorimetric Detection ◽  
Hexanoic Acid ◽  
Bromocresol Purple ◽  
Fiber Membrane ◽  
Color Changes ◽  
Before And After ◽  
The Difference ◽  
Imagej Software

Abstract An imprinted electrospun fiber membrane was developed for the detection of volatile organic acids, which are key components of human body odor. In this study, hexanoic acid (HA) was selected as the target, polymethyl methacrylate (PMMA) was used as the substrate, and colorimetric detection of HA was achieved by a bromocresol purple (BCP) chromogenic agent. The results showed that the morphology of the fiber membrane was uniform and continuous, and it showed excellent selectivity and specificity to HA. Photographs of the color changes before and after fiber membrane adsorption were recorded by a camera and quantified by ImageJ software by the difference in gray value (ΔGray). This method is simple, intuitive, and low cost and has great potential for application in human odor analysis.

scholarly journals Spectroscopy in heterogenous media and applications for bioprocess and environmental monitoring

2002 ◽  
Vol 4 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Frank Schael ◽  
Oliver Reich ◽  
Sonja Engelhard
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Transport Theory ◽  
Radiation Transport ◽  
Diffusion Theory ◽  
Nile Blue ◽  
Milk Powder ◽  
Photon Migration ◽  
Heterogenous Media ◽  
Reflectance Measurements

Diffuse reflectance measurements and photon migration studies with near infrared (NIR) diode lasers were employed to elucidate experimental methods for determining absorption and scattering coefficients and species concentrations in heterogenous media. Measurements were performed at a number of wavelengths utilizing several laser sources some of which were widely tunable. In order to establish the applicability of simple photon migration models derived from radiation transport theory and to check the experimental boundary conditions of our measurements, simple light scattering solutions (such as suspensions of titanium dioxide, latex particles, and solutions of milk powder) containing dyes (such as nile blue, isosulfan blue) were investigated. The results obtained from diffuse-reflectance studies at different sourcedetector distances were in accordance with predictions from simple photon diffusion theory. Applications of reflectance measurements for monitoring of cell growth during fermentation processes and forin-situinvestigations of soils are presented.

scholarly journals Color in ostracode shells: taphonomy and paleotemperature interpretation

1992 ◽  
Vol 6 ◽  
pp. 172-172
Author(s):  
Mervin Kontrovitz ◽  
Jerry Marie Slack ◽  
Nigel R. Ainsworth ◽  
Richard D. Burnett
Keyword(s):  
Elevated Temperatures ◽  
Geologic History ◽  
Pale Yellow ◽  
Color Changes ◽  
Igneous Intrusions ◽  
Wide Range ◽  
Color Differences ◽  
Dark Color ◽  
Coloring Agents ◽  
Organic Rich Sediment

Interpretations of geologic history would be enhanced if taphonomic processes, including color changes in shells, were better known. This study deals with the origins and alteration of post-mortem colors in podocopid ostracodes. Modern shells were subjected to elevated temperatures and pressures in reactor vessels with sediments, simulating some burial conditions. Fossil shells from outcrops and boreholes were heated and treated with solvents, in an attempt to identify the coloring agent(s).Modern marine shells are white to pale yellow (Munsell 5Y 8/1 – 2.5Y 8/4). Upon heating at atmosphere, up to about 650°, they became slightly redder, slightly darker, and less color saturated, but never dark (Munsell “value” less than 5). From 650-850° they became yellower and lighter, and above 850° chalky and more yellow. Shells at elevated temperatures and pressures (T-P) with organic-poor sediments and/or iron compounds developed higher color values and lower chromas; they did not become dark. Thus, modern ostracode shells subjected to elevated T-P changed colors, but alone never attained the dark colors seen in many fossils. Only those heated in matured organic-rich sediment and/or crude oils became dark (dark grays, browns, and blacks), like some fossils. Fossil ostracodes from boreholes in Mesozoic and Cenozoic sedimentary rocks showed downhole color differences similar to those from experiments. That is, the colors of fossils are different in hue, value and chroma in different thermal zones and ostracode color appears to be broadly indicative of thermal history.Fossils near igneous intrusions are dark, while the lowered values and chromas of those in metamorphics also are correlatable with paleotemperatures. Reheated dark fossils lightened at about 375-450°, eventually becoming pale yellow to white, apparently indicating that organic coloring agents were driven off. This, and the fact that modern ostracodes develop dark colors only when heated in organic-rich substances, support the contention that the dark color originates from extrinsic organic materials. Pyritized shells become weak red (Munsell 10R 4/4) upon heating; thus, they can be distinguised from those colored by organics.Therefore, ostracode colors appear to be diagnostic of T-P and present the potential for use in paleotemperature reconstructions. A wide range of fossils, including conodonts, phosphatic brachiopods, scolecodonts, and palynomorphs are known to show recognizable and useful evidence of thermal maturation and it is proposed that ostracodes be added to the list.

Sensory and Color Changes Induced by Microoxygenation Treatments of Pinot noir before and after Malolactic Fermentation

2010 ◽  
Vol 61 (4) ◽  
pp. 474-485 ◽  
Author(s):  
Dominik Durner ◽  
Fabian Weber ◽  
Janine Neddermeyer ◽  
Katharina Koopmann ◽  
Peter Winterhalter ◽  
...  
Keyword(s):  
Malolactic Fermentation ◽  
Pinot Noir ◽  
Color Changes ◽  
Before And After
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