Thank you guys.
Ron, as hard as this might be to believe, it is true.
The etch itself is about the same as usual except for this suggestion. Place a fish aquarium air bubbler in the bottom of the ferric chloride tank and let it bubble while you are etching your blade. This seems to stir the acid in a consistent manner. I have not tested this to know just what difference it makes but will.
Ok here is the part that is pretty wild. After the last etch, go straight from the etch to clean water, then into a bath of strongly mixed instant coffee. It's much stronger than if it were for drinking. Don't touch the blade with your hands at any point during this for the same reasons as usual. Leave the blade suspended in the coffee for several hours and don't mess with it.
This will serve to darken the dark steel of the Damascus pattern and it seems to be pretty durable. It stands to reason the more of the dark steel per bright steel you mix in you pattern the more impact this method will make. In other words some patterns will benefit more from the coffee soak while other patterns wont show the dramatic difference quite as much.
Felix's knife was soaked in the coffee as well as Ethan's knife.