A method of manufacturing an electronic device including the steps of: - jetting a radiation curable solder mask inkjet ink to a dielectric substrate containing an electrically conductive pattern, the radiation curable inkjet ink comprising a cationic polymerizable compound and a photoinitiating system, the photoinitiating system including a sulphonium compound according to Formula I and a Thioxanthone, wherein Y is selected from S, O, -CH 2 -, CO, NR4; R4 is selected from H, a substituted or unsubstituted alkyl group and a substituted or unsubstituted aryl group; R1, R2 and R3 are independently selected from the group consisting of H, a substituted or unsubstituted C1-C6 linear or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted O-alkyl group, a hydroxyl group, a halogen, a substituted or unsubstituted S-alkyl group, a substituted or unsubstituted S-aryl group, a NR5R6 group, R5 and R6 are independently selected from the group consisting of H, a substituted or unsubstituted linear or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, X is a group of the general formula MQ p , M is B, P, As or Sb; Q is F, Cl, Br, I, or perfluorophenyl; and p is an integer from 4 to 6, - curing the jetted solder mask inkjet. - jetting a radiation curable solder mask inkjet ink to a dielectric substrate containing an electrically conductive pattern, the radiation curable inkjet ink comprising a cationic polymerizable compound and a photoinitiating system, the photoinitiating system including a sulphonium compound according to Formula I and a Thioxanthone, wherein Y is selected from S, O, -CH 2 -, CO, NR4; R4 is selected from H, a substituted or unsubstituted alkyl group and a substituted or unsubstituted aryl group; R1, R2 and R3 are independently selected from the group consisting of H, a substituted or unsubstituted C1-C6 linear or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted O-alkyl group, a hydroxyl group, a halogen, a substituted or unsubstituted S-alkyl group, a substituted or unsubstituted S-aryl group, a NR5R6 group, R5 and R6 are independently selected from the group consisting of H, a substituted or unsubstituted linear or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, X is a group of the general formula MQ p , M is B, P, As or Sb; Q is F, Cl, Br, I, or perfluorophenyl; and p is an integer from 4 to 6, Y is selected from S, O, -CH 2 -, CO, NR4; R4 is selected from H, a substituted or unsubstituted alkyl group and a substituted or unsubstituted aryl group; R1, R2 and R3 are independently selected from the group consisting of H, a substituted or unsubstituted C1-C6 linear or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted O-alkyl group, a hydroxyl group, a halogen, a substituted or unsubstituted S-alkyl group, a substituted or unsubstituted S-aryl group, a NR5R6 group, R5 and R6 are independently selected from the group consisting of H, a substituted or unsubstituted linear or branched alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, X is a group of the general formula MQ p , M is B, P, As or Sb; Q is F, Cl, Br, I, or perfluorophenyl; and p is an integer from 4 to 6, - curing the jetted solder mask inkjet. <EOS>