Reflection of transparent object is visible I have an object in front of a mirror that i only make visible later in an animation.
Therefore, i made the object transparent, but the reflection of the object is still visible when i render it it. 
I use Blender Render.
The object is transparent but the reflection is visible. 
How do I make the reflection transparent as well?

Thanks!
Visibility settings in the Outliner (the little 'eye' and 'camera' icons) can be keyframed by pressing 'I' on them, so you can make your object appear at a certain frame of the animation.