Table 7.

Comparison of ∆E variant amongst the three groups after multiple firings

Firings	∆E Group I	∆E Group II	∆E Group III
2	18.66	17.23	16.4
3	19.46	16.89	16.3
4	19.74	17.1	16.74
6	19.77	17.55	16.87
8	19.82	17.86	16.72
10	19.78	17.69	16.59