Table 3.

Intensity levels of gray shade of blend pigments.

Pigment-to-silica mass ratio	Gray shade	Shade difference (%)
1:0	82	0.0
1:1	91	−11.0
1:3	103	−25.6
1:5	104	−26.8
1:8	106	−29.3
1:10	107	−30.5