It would help if you had Strict and Explicit on, something you've been told numerous times.

An experiment / hint

Code:
        Dim colour(2) As Color

        colour(0) = Color.FromName("Blue")
        colour(1) = Color.FromName("red")
        For Each s As String In From c In colour Select c.Name
            If [Enum].IsDefined(GetType(KnownColor), s) Then
                'Color ok
                Stop
            Else
                Stop
            End If
        Next