“Liscio Crystal Straightening System is the foundation for glossy, manageable hair that can support a variety of exciting hairstyles. Its gentle, deep-penetrating formula works quickly to straighten curls and waves with more crystal-like shine and more softness than ever before. Liscio actively smoothes, repairs, and protects hair inside and out, safely maintaining hair’s integrity after repeated processing.
Liscio Crystal is a 100% formaldehyde-free permanent straightening product. The active ingredient is AMMONIUM THIOGLYCOLATE. This product cannot be used on hair that has been treated with henna, sodium hydroxide relaxers, or metallic dyes.“