Jennifer Joseph takes this tradition and injects it with toughness, giving it bite. These paintings are deliciously grungy: Abstract Expressionism after the Sex Pistols, after the time of hope. Having paid their homages they go their own way, making no concessions. Their energy is concentrated, dark and unforgiving. Colour is used sparingly, and, when it does appear, is either murky or pugnacious. Blackness predominates. Although there are areas that are (almost despite themselves) subtle and delicate, the calligraphic marks are invariably bold and assertive, the geometry insistent.