Neocate Poo..

I tried researching a bit on the forum, but still did not find what i was looking for. Kendra has been having green and black poos on the Neocate formula. is the black poo normal? is usually dried and leaves her bottom red, unlike the green one. We have been trying some baby food. Peaches, bananas, pears. It changes from green to black, but it has been more black looking. i read some where that black poo could be blood??? help! i hope this is normal.
thanks ahead!!!