The term brightness constancy is identified in base64 scheme by the sequence YnJpZ2h0bmVzcyBjb25zdGFuY3k=, while the MD5 signature is equal to 61e8a1a7e5533cce9afb9cb49d77ca4b. The ASCII encoding of brightness constancy in hexadecimal notation is 6272696768746e65737320636f6e7374616e6379.