Quote Originally Posted by rjs003 View Post
I have formed the habit of shaking the bottle before using.
I do this with everything: milk, orange juice, paint; so why not developer.
Discovered this with old Rodinal that had sat for several months.
If there are two or more ingredients, and the product sits for any length of time seperation will occur.
While it might not do any harm with Rodinal, I would generally advise against shaking developers, as it will introduce oxygen into the solution, which will have a negative impact on the life expectancy of most developing agents.