Ifmaterials are transferred into other containers, the employer mustensure that these are labeled as well, unless they fall under theportable container exemption (paragraph f(7)). In terms of labelingsystems, you can choose to use the labels provided by your supplierson the containers.
Confidence votes 178. Iodine is often called a mordant when used in the gram stain. What its function is, is to form large crystals with the Crystal Violet dye used as the first stain.
1 The counterstain stains both gram-negative and gram-positive cells. 2  However, the purple gram-positive color is not altered by the presence of the counter-stain, itâs effect is only seen in the previously colorless gram-negative cells which now appear pink/red. 3  Blot gently and allow the slide to dry. 4  Do not smear. The heat-fixed cells should look purple at this stage. 2  Add iodine (Gramâs iodine) solution (1% iodine, 2% potassium iodide in water) for 1 minute. 3  This acts as a mordant and fixes the dye, making it more difficult to decolorize and reducing some of the variability of the test. 4  Briefly rinse with water.