I was recently advised that I should be storing my empty film holders with the dark slides removed. The rational being that leaving the dark slides in compresses the "flocking" (?) in the slot which, eventually allows the dark to escape when the dark slide is removed. While this sounds like perfectly reasonable advice, I wonder whether there is really any need to do this - from a practical point of view. So, I guess my questions are: 1) Do you store your film holders with dark slides in or removed? and... 2) does anybody have any evidence to support the claim that storing holders with dark slides in place leads to light leaks?