The purpose of this study was to measure and compare the colour stability of three porcelain repair materials (Charizma, Clearfil and Silux Plus) with an all-ceramic material following accelerated ageing. Three composites and one ceramic control were subjected to accelerated ageing for a period of 300 h. Initial specimen colour parameters were determined in the Commission international de I'Eclairage Lab (CIELAB) colour order system with a colorimeter. Colour changes were calculated before (AE) and after 300 h of accelerated ageing (Delta E*). Colour difference data were subjected to one-way analysis of variance (ANOVA) followed by Duncan's test to examine the interaction between material and time interval of ageing. There were no significant difference between Delta L values of Porcelain-Charizma and Porcelain-Silux Plus. All mean Delta L* values were negative after 300 h ageing. Porcelain-Silux Plus demonstrated the highest Delta L* of the investigated groups. There were significant differences between baseline 300-h aged specimens with respect to Delta a*, Delta a for either of the investigated materials. For Silux Plus, Delta a and Delta a* values were significantly higher than the others. Significant differences were observed between baseline and 300-h values for Delta b and Delta b*. Delta b and Delta b* values were significantly higher for Silux Plus. There were significant differences between baseline and 300-h values of colour difference, Delta E, Delta E*. Highest Delta E* value was obtained using the microfilled composite, Silux Plus. Lowest value of Delta E was recorded with the hybrid composite, Charizma.