Do crystals grow better on yarn or string?

Crystals generally grow better on string rather than yarn because string is typically smoother and provides a more uniform surface for crystal formation. Yarn, being textured and fibrous, can disrupt the growth process by trapping air bubbles or creating uneven surfaces. Additionally, the materials used in yarn may introduce impurities that can hinder crystal development. Overall, the choice of string can lead to more consistent and larger crystal growth.