Transparent coating on a color surface.

Area of Science:

• Materials Science
• Optical Physics
• Color Science

Background:

• Transparent coatings and laminates applied to colored materials can cause significant color shifts.
• Internal reflection at the surface interface is a primary cause of these color changes, leading to altered selective absorption.

Purpose of the Study:

• To develop a predictive model for color change in slabs with surface coatings.
• To quantify the impact of internal reflection on bulk reflectance and color properties.

Main Methods:

• Development of a random walk model to simulate light interaction within a coated slab.
• Calculation of CIELAB color parameters from predicted reflectance factors.
• Comparison of model predictions with Monte Carlo simulations for validation.

Main Results:

• The random walk model accurately predicts reflectance factors, showing good agreement with Monte Carlo simulations.
• Coating application results in minimal change to hue.
• Significant increases in saturation and decreases in lightness are observed for coated slabs.

Conclusions:

• The developed random walk model effectively predicts color changes in coated materials.
• Internal reflection is a key factor influencing the perceived color of coated slabs, primarily affecting saturation and lightness.
• The model provides a valuable tool for predicting and understanding color alterations in coated materials.