LCN Recolution is solvent free, acid free, long wearing and highly durable permanent gel polish . Solvents are used in many brands of gel polish to maintain a thin viscosity. However, adding solvents to gel polish will eventually cause the polish to thicken and become unusable, as every time the bottle is opened some of the solvents will dissipate.  LCN does not add solvents or acid to Recolution, so it will never thicken and become unusable, which allows you to use every last drop. The Recolution bottle also has a longer application brush, and a bigger 10ml bottle. No waste means better value!