Do I add the coloring when I am melting it with the corn syrup?

And can I make 2 batches at once or do I need to do them separate?

I need enough to make a 1/2-1 in ribbon to go around a 10in circle; a small bow, zebra stripes on a 12 in square, and the girls name. I'm hoping 2 batches is enough.

A person I know who works with modeling chocolate adds powdered colors to it after it's made. Wilton does make candy colors which you can add to it also, they have black as one of the colors.

I couldn't tell you much about making it though.

I could only find chocolate so I figured I could add black to it.

I use americolor gels and wilton gels to color chocolate clay and they both work just fine. (check the pics of the chocolate clay roses in my pics, they are all colored this way!)

You probably would knead it in like regular color for fondant.