R Medical Supply

Staining

Stains on instruments can vary in color from orange to brown to black and are sometimes mistaken for rust. Rust on a stainless steel instrument seldom occurs. Stains may originate from the following possible causes:

  • Phosphate from water, detergents or cold sterilization solutions;
  • pH levels either too high or too low;
  • Dried on blood or biodebris;
  • Not using distilled or de-mineralized water
  • Combining metals that are not the same in ultrasonic cleaners or in the autoclave (reverse platting);
  • Excessive heat in the autoclave;
  • Water droplets drying on the surface;
  • Autoclave not eliminating all moisture from the instrument by the cycle end; and
  • Metal deposits still remaining on new instruments that were not removed by cleaning first prior to autoclaving.