Fig. 8. Scanning electron microscopy micrographs of control background ( A , 7,500×), 1% propofol alone ( B , 7,500×), and oil droplets at 30 min ( C , 7,500×) and 24 h ( D , 5,000×) after the addition of 40 mg lidocaine to 20 ml propofol, 1%. The white line in each figure indicates 10 μm. From Masaki et al. 83 ; reproduced with permission.