</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (tschmid @ May 2 2003, 04:28 AM)</td></tr><tr><td id='QUOTE'> The main reason why fixer usually is acid is to block remaining developer. Even if you use an acid stop, some developer might remain in the emulsion and might become active again in a basic solution. So fix should be at least neutral.

Acid fix actually breaks down faster than alkaline; it&#39;s the sulfite that preserves, not the acidity. </td></tr></table><span class='postcolor'>
This was not the reason given by E. Vogel in the 1904 book. Besides, the fixing process will effectively stop the development by removing the active silver halides: Monobath developers/fixers are very concentrated and extremely alkaline for this very reason. Unless the fixer is well past its usable life and the developer extremely concentrated, there will be no detectible development taking place in even the most alkaline fixers.