Types of 221 (g): There are different reasons for refusal under 221(g) section and the visa officer will give a color coded form. U.S. Embassy uses a specific color coding for each form to indicate the type of 221(g) and the form has instructions to be followed and documents necessary to be provided by the applicants for further processing of their visa application. The following are the color codes and the explanation of what each color means: Blue Slip: A 221g Blue slip is given