Procedure for Tristimulus Color Measurements on Building Stone

摘要

This report describes a procedure used to measure the color of building stone surfaces using a specific tristimulus colorimeter with three color filters. Color changes are to be monitored during a ten year or more outdoor exposure period to determine the effects of acid rain on stone color. A step-by-step procedure is provided, including equipment calibrations and checks using standard reflectance panels, equipment checks using standard stone surfaces, and color measurements of stone surfaces which are to be, or have been exposed at field sites.