MICO-TROL Co-Injection Fluid contains a revolutionary drainage chemical that not only helps insure better circulation, but also improves the coloring effect by breaking down fluid surface tension.  MICO-TROL Co-Injection Fluid is especially good for difficult cases that require a strong formalin fluid because it minimizes dehydration, without affecting tissue firmness, thus creating remarkable softness, and a life-like appearance.  MICO-TROL Co-Injection Fluid does not contain a preservative.