Question: what is tosylamide formaldehyde resin?
Answer: Tosylamide Formaldehyde Resin (TSFR) has been one of the commonest cosmetic contact allergens. TSFR is a thermoplastic resin which hardens as it dries. It facilitates adhesion and improves shine, rigidity, and flow in the application of nail polish to nails. In addition, it helps nail varnish last on nails.