1. Checked eggs that haven't hatched and are all black with exception of slanted air cell. Some I can see veins a little around edge but didn't notice movement, are these still viable? 2. Read somewhere I believe that the slanted air cell means ready to hatch is that correct? 3. If egg is black excepts air cell, but can't see veins or movement is the egg dead? 4.If egg is black excepts air cell, but can see veins or and no movement is the egg dead?