Some one mentioned that they are wondering whether or not the presence of gaseous bubbles in the condition of pure supercritical CO2 (initial conditions of 31.1 deg.C temperature and 72.9 atm pressure) or in the mixture of supercritical CO2 with other aqueous solution (electroplating electrolyte for example).
The presence of gaseous CO2 bubbles in the mixture with Watts electrolyte has been reported in a number of works on literature as the contribution to the formation of the periodic characteristic plating resulted in smoother coating surface and finer grains.