Props and special effects were fairly simple and limited by the budget. The blood, for example, was Bosco Chocolate Syrup drizzled over cast members' bodies. Consumed flesh consisted of roasted ham and entrails donated by one of the actors, who also owned a chain of butcher shops. Costumes consisted of second-hand clothing from cast members and Goodwill. Zombie makeup varied during the film. Initially, makeup was limited to white skin with blackened eyes; but as filming progressed, mortician's wax was used to simulate wounds and decaying flesh. As filming was not linear, the piebald faces appear sporadically. Eastman supervised the special effects, wardrobe and makeup. The small budget led Romero to shoot on 35 mm black-and-white film. The completed film ultimately benefited from the decision, as film historian Joseph Maddrey describes the black-and-white filming as "guerrilla-style", resembling "the unflinching authority of a wartime newsreel". Maddrey adds, it "seem as much like a documentary on the loss of social stability as an exploitation film".