A compound of Formula (1) and salts thereof: ##STR00001## wherein: Q is an optionally substituted aryl ring; Y is CO.sub.2H, SO.sub.3H or PO.sub.3H.sub.2; R and X are substituents; m is 0 to 3; n is 0 to 6; and q is 0 to 6. Also compositions comprising these compounds, ink-jet inks, an ink jet process and an ink-jet cartridge.