The term dark ground illumination is identified in base64 scheme by the sequence ZGFyayBncm91bmQgaWxsdW1pbmF0aW9u, while the MD5 signature is equal to f80a62677a0e539d4b94f0c1a6c99ab5. The ASCII encoding of dark ground illumination in hexadecimal notation is 6461726b2067726f756e6420696c6c756d696e6174696f6e.