The term substantia grisea is identified in base64 scheme by the sequence c3Vic3RhbnRpYSBncmlzZWE=, while the MD5 signature is equal to 044af34c2ae01af453f21f8acd4e603a. The ASCII encoding of substantia grisea in hexadecimal notation is 7375627374616e74696120677269736561.