A radiation curable ink formulation comprising a) 10 to 70 % by weight of at least one trifunctional (meth)acrylate monomer as component A, the at least one trifunctional (meth)acrylate monomer selected from the group consisting of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, propoxylated glycerine triacrylate and mixtures thereof, b) 5 to 40 % by weight of at least one (meth)acrylate monomer with a functionality of 4 or higher as component B, the at least one (meth)acrylate monomer selected from the group consisting of pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, di-trimethylolpropane tetraacrylate, di-pentaerythritol pentaacrylate, dipentaerythritol hexaacrylate and mixtures thereof, c) 0 to 20 % by weight of one or more monofunctional (meth)acrylate monomers and/or difunctional (meth)acrylate monomers as component C, the one or more difunctional (meth)acrylate monomer selected from the group consisting of dipropylene glycol diacrylate, tripropylene glycol diacrylate, 1,6 hexanediol diacrylate, triethyleneglycol divinylether, 1,4-cyclohexane dimethanol divinyl ether and mixtures thereof, d) 2 to 30 % by weight of at least one photoinitiator as component D, the at least one photoinitiator being selected from the group consisting of di-ester of carboxymethoxybenzophenone and polytetramethyleneglycol 250, di-ester of carboxymethoxy thioxanthone and polytetramethyleneglycol 250, Bis(2,4,6-Trimethylbenzoyl)phenylphosphine oxide and mixtures thereof, e) 15 to 50 % by weight of at least one amine synergist as component E, the at least one amine synergist being selected from the group consisting of aminobenzoates, acrylated amines and amine modified acrylates and mixtures thereof, f) 0 to 40 % by weight of one or more (meth)acrylate oligomer as component F, the one or more (meth)acrylate oligomer being selected from the group consisting of epoxy acrylates, polyester acrylates, urethane acrylates, melamine acrylates, polyether acrylates, acrylic acrylates and mixtures thereof, and g) 0 to 60 % by weight of one or more pigment and/or additive as component G. a) 10 to 70 % by weight of at least one trifunctional (meth)acrylate monomer as component A, the at least one trifunctional (meth)acrylate monomer selected from the group consisting of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, propoxylated glycerine triacrylate and mixtures thereof, b) 5 to 40 % by weight of at least one (meth)acrylate monomer with a functionality of 4 or higher as component B, the at least one (meth)acrylate monomer selected from the group consisting of pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, di-trimethylolpropane tetraacrylate, di-pentaerythritol pentaacrylate, dipentaerythritol hexaacrylate and mixtures thereof, c) 0 to 20 % by weight of one or more monofunctional (meth)acrylate monomers and/or difunctional (meth)acrylate monomers as component C, the one or more difunctional (meth)acrylate monomer selected from the group consisting of dipropylene glycol diacrylate, tripropylene glycol diacrylate, 1,6 hexanediol diacrylate, triethyleneglycol divinylether, 1,4-cyclohexane dimethanol divinyl ether and mixtures thereof, d) 2 to 30 % by weight of at least one photoinitiator as component D, the at least one photoinitiator being selected from the group consisting of di-ester of carboxymethoxybenzophenone and polytetramethyleneglycol 250, di-ester of carboxymethoxy thioxanthone and polytetramethyleneglycol 250, Bis(2,4,6-Trimethylbenzoyl)phenylphosphine oxide and mixtures thereof, e) 15 to 50 % by weight of at least one amine synergist as component E, the at least one amine synergist being selected from the group consisting of aminobenzoates, acrylated amines and amine modified acrylates and mixtures thereof, f) 0 to 40 % by weight of one or more (meth)acrylate oligomer as component F, the one or more (meth)acrylate oligomer being selected from the group consisting of epoxy acrylates, polyester acrylates, urethane acrylates, melamine acrylates, polyether acrylates, acrylic acrylates and mixtures thereof, and g) 0 to 60 % by weight of one or more pigment and/or additive as component G.