. 2015 May 15;45(3):130–135. doi: 10.4041/kjod.2015.45.3.130

Table 2. Color differences measured in ΔE^* and NBS units after immersion in the coffee solution.

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ΔE^* values were converted to National Bureau of Standards (NBS) units by the equation: NBS units = ΔE^* × 0.92. For each glass-fiber-reinforced plastic (GFRP), there were no significant differences in color change for any of the immersion periods (p > 0.05).

Table 2. Color differences measured in ΔE* and NBS units after immersion in the coffee solution.

Table 2. Color differences measured in ΔE^* and NBS units after immersion in the coffee solution.