Peel-Off Powder Mask Composition

The powder mask that turns into a thick gel when mixed with water and solidifies into a peelable film when dry primarily uses Sodium Alginate to create the gel texture.

However, as you observed, Sodium Alginate alone typically forms a viscous gel but does not solidify into a peelable film. The solidification and peelable property come from the reaction between Sodium Alginate and calcium ions.

Therefore, formulations for this type of mask must include an ingredient that provides calcium ions. Common ingredients used to achieve this solidification and peel-off effect include Calcium Chloride or other calcium salts. The calcium ions react with Sodium Alginate to form a cross-linked gel structure that hardens and becomes peelable.