I took a video from 2013, where I reviewed Chavant's LE BEAU TOUCHÉ HIGH MELT CLAY, and repoasted it here on Youtube.
Claude Chavant was a French chemist who developed Professional Plasteline in 1892. He founded the company named Chavant at that time. The Plasteline name was trademarked in 1927. Chavant's been a leader in creating professional clays for a very long time.
You can purchase Chavant from Sculpture Depot in Loveland Colorado.