Lac, edible, is a hard amorphous natural resin & considered GRAS by the FDA.  

Lac is one of the oldest finishes around, it forms smooth, high gloss films and surfaces. Lac has a good resistance against solvents based on hydrocarbons. It is thermoplastic & non toxic. It is approved for various applications in the food industry. Lac is a true multi-talent at home in many industries. This durable and amorphous natural resin offers excellent physical and chemical features and is thus a sustainable alternative to synthetic resins. A high degree of elasticity and outstanding film-forming characteristics make Lac the ideal basis for binders and insulating products, for primers and protective, stabilizing coatings.