The color definition should look like: "rrggbb" ,where:

Note:

Examples:

"ff0000"      
"00ff00"      
"0000ff"      
"ffff00"  
"ff00ff"  
"00ffff"  
"ffffff"  
"e0e0e0"  
"c0c0c0"  
"808080"  
"ff80ff"      
"ff0080"      
"ff80c0"      
"0080ff"  
"8080ff"  
"80ffff"  
"80ff80"  
"ffff80"  
"c0c000"  
"c0c080"  
"000000"      
"c00080"      
"c000c0"      
"00c000"  
"008000"  
"0000c0"  
"000080"  
"ff8000"  
"c00000"  
"800000"