Ashley Pellerin, a Prairie View A&M Extension agent, believes the color purple was used because those who are colorblind can still see it. The law says the vertical purple markings must be clearly visible, and should be 8 inches long by 1 inch wide. 

The Purple Paint Law is also in effect in the state of Illinois, where lawmakers hoped that the markings would deter hunters. “Most hunters are very respectful,” Illinois Forestry Association Secretary Dave Gillespie told the Chicago Tribune, “but there are always bad guys who aren’t and ruin it for the rest of us.”