The Gram Stain is used for the differiential staining of bacteria. Set consists of “pre-mixed” iodine. FDA approved for in vitro diagnostic use. Gram stain sets and component replacements are specifically formulated for differential staining of bacteria from cultures or patient specimens. Gram stain sets offer the laboratory a choice of stabilized iodine or traditional, non-stabilized iodine and are in a variety of sizes to meet the needs of laboratory personnel. For Professional Use Only.