The present disclosure relates to a method of printing a radiation-curable ink composition on a substrate. A radiation-curable ink composition is deposited onto a substrate. The radiation-curable ink composition comprises a photoinitiator in an amount of not more than about 4.5 weight %. The deposited ink composition is irradiated with UV radiation. The irradiated ink composition is heated to a temperature of at least about 75 degrees C. The UV radiation is from an LED source or is centred at a wavelength selected from the group consisting of 375 nm, about 385 nm and about 395 nm.