The term acid-base indicator is identified in base64 scheme by the sequence YWNpZC1iYXNlIGluZGljYXRvcg==, while the MD5 signature is equal to 53a868157899d36cf49e27764405d6e8. The ASCII encoding of acid-base indicator in hexadecimal notation is 616369642d6261736520696e64696361746f72.