What does the green form+blue form of American immigrant visa probably mean?

After the interview, you will be given 1 and a red bar (red note)-indicating that you passed; 2. Blue column (blue list)-indicates that it is necessary to fill in the materials or wait for approval, and then decide whether to approve after filling in the materials or reviewing them; 3. White slip-visa refused. I've never heard of green stripes. If it is with blue stripes, it is likely to be a description of supplementary materials.