Colour and chemical stability of bismuth oxide in dental materials with solutions used in routine clinical practice
Fig 5
L*a*b* colour coordinate time trajectory plots.
Data for all treated and exposed materials, with projections on each 2-axis plane. The control is for 24 weeks, dark and light, no added CO2. The L* axis (0,0,0) ~ (100,0,0) is drawn in for reference (+···+). ‘Initial’: as-supplied material.