OMR sheets can be printed in black and white as well as color. The color of the OMR sheets depends on the OMR marking pattern. The OMR software detects and reads dark, black marks and hence candidates are asked to fill the OMR bubbles completely.
In such case, the black and white OMR sheets work perfectly as the software can distinguish between the dark marks on the bubbles and the thin lines of the outlines and other stray marks. However, if tick mark is the marking pattern, then the software would not be able to distinguish between the thin mark and other stray marks on the black and white OMR sheet. Hence, colored OMR sheets are used.
Colored OMR sheets can be designed with the help of Addmen OMR software.
Two colors have to be used for designing these sheets
The use of color black is mandatory, for printing the index points.
Other colors used for printing the OMR bubbles can be pink, red, orange, golden yellow, etc.
Blue and green shades have to be avoided completely.
When the colored OMR sheets are read by the OMR software, the colors are dropped and the software easily detects the tick marks, even if they are really thin.
Colored OMR sheets are specially used in OMR survey and feedback forms where the participants are likely to put a tick mark to choose their options rather than filling the entire bubble.