If it is necessary to use colors , try to choose colors that are unambiguous -LRB- such as orange and violet -RRB- when viewed by a person with red-green color blindness -LRB- the most common type -RRB- .

If it is necessary to use colors , try to choose colors that will not be confusing to a person with red-green color blindness -LRB- the most common type -RRB- . Colors that are okay to use include orange and violet .
