i have not had any samples tested, don't really see any need, just a thought and a possible solution for those on a tight budget. it is interesting that in more than 50 years the record speed has only increased by 40%. the entire procedure is performed by a specific needle and specialized technique. brows define the high points of your face and give it some definition. approximately 3.9 million of those are dogs and 3.4 million are cats. because it is natural, it can maintain the natural solid color. we catch as much of it as we can. 