This fine powder is often used in theatres to stop cut cloths treated with Copydex, Flintdex or Weave Filler from sticking together.

French Chalk will also stop floor boards and treads from creaking.

It has nothing to do with chalk and is actually magnesium silicate used widely for its slippery effect. I don’t think it even comes from France!

Please note: It is not suitable for making gesso.