Table 1 also shows the effect of β-NA concentration on the haze and color fading of the neat iPP and the β-NA nucleated iPP. Haze is related with the cloudiness or the loss of contrast due to light scattering at large angles. It is the fraction of the transmitted light which deviates from the directly transmitted beam. In Table 1, higher haze was observed with increasing β-NA concentrations. A 33% increment of haze was found when β-NA was added at 0.50 wt%, corresponding to the least transparent β-NA nucleated iPP. It was evident that the appearance of the iPP changed from transparent to cloudy when β-NA content increased to 0.30 wt%, this was accompanied by increasing haze value and the whiteness index L∗. The transparency of the β-NA modified iPP was reduced due to higher crystallinity induced in the β-NA nucleated iPP, the numerous fine crystals obstructed the transmission of light. In terms of yellowness, there was no significant difference in terms of yellowness between the neat iPP and all the β-NA nucleated iPP indicating that the specimens did not changed to yellow shade.