You're welcome, Hubert. You're probably not incorrect calling it a splotch. I don't think there is an absolutely correct term to describe it. You may or may not obtain any blotched offspring from the cross. It seems a lot of that depends upon whether the mate has any inhibiting factors against the dark petal base. Some seedlings can have enormous dark bases while others can show nothing or just a slight hint. I've seen photos of seedlings whose dark petal bases covered nearly the entire petal. They looked like dark colored flowers with a lighter picotee, except when opened under high heat, the dark area nearly disappeared.