The term absorption spectrum is identified in base64 scheme by the sequence YWJzb3JwdGlvbiBzcGVjdHJ1bQ==, while the MD5 signature is equal to 1b86185cce306e0701e3bbda8e551f6c. The ASCII encoding of absorption spectrum in hexadecimal notation is 6162736f727074696f6e20737065637472756d.