Supercritical fluid material finishing

A method of finishing a target material in a pressure vessel while reducing deposition of a finishing material in the pressure vessel, the method comprising;

• positioning a target material in a pressure vessel;
• introducing carbon dioxide (“CO2”) within the pressure vessel;
• increasing an internal temperature of the pressure vessel to an operating temperature;
• increasing a pressure within the pressure vessel to an operating pressure, wherein the CO2 is at supercritical fluid (“SCF”) state when at the operating temperature and the operating pressure;
• perfusing, using SCF CO2, the target material with a finishing material;
• increasing a flow rate to a nonzero rate during the perfusing of the target material with the finishing material, wherein the flow rate in a range of 175-240 m3/hr;
• reducing the pressure from the operating pressure to a transition pressure prior to reducing the operating temperature to a threshold temperature;
• and
• reducing the flow rate to a flow rate in a range of 90-130 m3/hr after reducing the pressure from the operating pressure.