Very efficient, fast curing photoinitiator which is especially good for curing cyan inks. 907 exhibits low yellowing which means it can be used in screen inks and white lacquers as well as its main application, resist inks. 907 is easily sensitised by small amounts (0.2-0.5%) of thioxanthones which significantly increase cure speed (e.g. adding 0.5% ITX to 2% 907 will more than double the cure speed).