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This paper suggests a further improvement to ISCC-NBS naming system for determining exact boundary color tone between color modifiers that associated each region on the Munsell color space. Three sequences of color tone stimuli were created for three fundamental hues red, green and blue by varying just two parameters, saturation and value. Two experiments were executed to investigate the consensual use of modifiers in describing perceptual variations of color tones by Japanese and Sinhala (Language of Sri Lanka) naive viewers. One was a triadic comparison method in which the color modifiers meaning - pale, bright, vivid, strong, dull, and dark - were employed. Results revealed that these modifiers were used in a consistent manner for all three hues. Second was a two-alternative forced-choice experiments that was executed to determined the boundary color tone at which modifier labels switch from bright to strong, and from vivid to dull.