Scientists have recently been working on color prediction of metallic coatings from measurements of common geometries in portable multi-angle spectrophotometers. Source: Capri23auto / Pixabay.
1. Nov 2018 | Coatings Technologies
Colour prediction of metallic coatings
Researchers have developed new models for colour prediction of metallic coatings from measurements at common geometries in portable multi-angle spectrophotometers.
Illuminating and viewing geometries may strongly affect the colour appearance of metallic coatings, which can be characterised accurately by bidirectional reflectance distribution function (BRDF) measurement devices. However, such devices with hundreds or even thousands of different geometries are usually expensive and complex. Accordingly, two modified models were developed in a new study, based on the distribution of aluminum-flake pigments in the coatings, to, respectively, estimate the spectral radiance factors and the CIE tristimulus values of metallic coatings utilising the measurements at six common geometries of portable multiangle spectrophotometers.
Results show effectiveness of methods
Their performance was examined with 65 achromatic and 20 chromatic metallic coating samples under D65, A, and F11 illuminants. The average CIEDE2000 colour differences over all 19 geometries were found to be less than 1.8 for both models, while the average CAM02-SCD and CIELAB color differences can, respectively, reach 1.7 and 2.0, indicating the effectiveness of the methods.
The study is published in: Journal of Coatings Technology and Research September 2018, Volume 15, Issue 5, pp 957–966.
Image source: Pixabay
Resins for Water-borne Coatings
Expand your knowledge and get fully acquainted with the various aspects of water-borne coatings - from production to properties to special features of their use! With the slow change from solvent-borne resins and coatings to water-borne coatings "Resins for waterborne coatings" is a must-read for any formulator wanting to expand their knowledge. The authors discuss important aspects of the "solvent-to-water-transition" of the past 40 to 50 years, take a deep dive into the key aspects and theories behind the production, properties and applications of these resins as well as providing an overview of how they are currently used in water-borne coatings.
You are currently not logged in
To leave a comment, please log in.
There was an error while sending your comment. Please try again.
Your comment was too long. There are a maximum of 2048 symbols allowed!