Color masterbatches for liquid silicone and rubbers for the healthcare industry are available from NuSil Technology, Carpinteria, Calif., (nusil.com). Masterbatches are concentrations of color dispersed in a polymer carrier. They shorten production times and eliminate the use of powders that may contaminate cleanrooms. The MED-4502 and MED-4800 lines of pigments are supported by master access files at the FDA and other documentation.