Abstract: A process for forming a photoresist pattern on a device, comprising; a) forming a layer of first photoresist on a substrate from a first photoresist composition; b) imagewise exposing the first photoresist; c) developing the first photoresist to form a first photoresist pattern; d) treating the first photoresist pattern with a hardening compound comprising at least 2 amino (NH2) groups, thereby forming a hardened first photoresist pattern; e) forming a second photoresist layer on the region of the substrate including the hardened first photoresist pattern from a second photoresist composition; f) imagewise exposing the second photoresist; and, g) developing the imagewise exposed second photoresist to form a second photoresist pattern between the first photoresist pattern, thereby providing a double photoresist pattern.