Last night I used Google to find more info on ‘chicken with green sauce’.. And this is one of the many results:

2. Making sauces look nice. If you are making a chicken soup or gravy and want it to have a golden color, you can either use a little bit of tumeric or a drop or two of yellow food coloring. This also works when making fresh pasta. It makes it look richer. … If you are making spinach pasta, use a couple of drops of green food coloring….

Not exactly what I was looking for, but still a good read.