injection mass

in·jec·tion mass

colored solutions or suspensions injected into a cadaveric vascular system to render vessels and their walls prominent; useful for gross preparations and for study under low magnification after clearing; most fluids contain warm gelatin and the coloring materials are carmine, Berlin blue, or carbon.
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The injection mass was kept constant at every, operation point and the first step when evaluating the results was to examine whether the specified torques could be achieved at full load.