The term optical crown glass is identified in base64 scheme by the sequence b3B0aWNhbCBjcm93biBnbGFzcw==, while the MD5 signature is equal to 583caa683d4845bd1c168a15b78bdc60. The ASCII encoding of optical crown glass in hexadecimal notation is 6f70746963616c2063726f776e20676c617373.