The term photochemical exchange is identified in base64 scheme by the sequence cGhvdG9jaGVtaWNhbCBleGNoYW5nZQ==, while the MD5 signature is equal to fc4af2d7324a88cdb1410c15235692d3. The ASCII encoding of photochemical exchange in hexadecimal notation is 70686f746f6368656d6963616c2065786368616e6765.