Always read ingredient labels before opening any recipient. Many witches had suffered unpleasant surprises because not to follow this simple rule. And if you can afford it, buy good quality ingredients (Ollivanders brand is excellent), this can also help to avoid some disasters, for instance, some ingredient makers don’t detach the bat wings from the actual bat just to save a few cents… and that, believe me, can be a terrible problem for you.
Bat wings