Board Thread:Dragon City Gameplay Questions & Answers/@comment-2.49.245.164-20130622030524/@comment-166.137.156.26-20130701010631

Nope. Not 100% chance. Granted the chance for a pure or pure elemental are a bit higher than normal, but the fact is that breeding a pure and pure elemental could result in any dragon. This is because both dragons have a pure element, which is a wildcard in breeding.