There are several ways of testing whether a kris is lucky or not. A series of cuts on a leaf, based on blade width and other factors, could determine if a blade was good or bad. Also, if the owner slept with the blade under their pillow, the spirit of the kris would communicate with the owner via dream. If the owner had a bad dream, the blade was unlucky and had to be discarded, whereas if the owner had a good dream the dagger would bring good fortune. However, just because a blade was bad for one person didn't mean it would be bad for another. Harmony between the weapon and its owner was critical.