セーフカラー#33~:#00~
#33FFCC #33FF99 #33FF66 #33FF33 #33FF00
#33CCCC #33CC99 #33CC66 #CCCC33 #CCCC00
#3399CC #339999 #339966 #339933 #339900
#3366CC #336699 #336666 #336633 #336600
#3333CC #333399 #333366 #333333 #333300
#3300CC #330099 #330066 #330033 #330000
#00FFCC #00FF99 #00FF66 #00FF33 #00FF00
#00CCCC #00CC99 #00CC66 #00CC33 #00CC00
#0099CC #009999 #009966 #009933 #009900
#0066CC #006699 #006666 #006633 #006600
#0033CC #003399 #003366 #003333 #003300
#0000CC #000099 #000066 #000033 #000000