Contrast Color Calculator

    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    
    C#        C#        C#        C#        C#        C#    

Custom Color: (from #ffffff to #000000)
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Result:     C#