This iron hat is based on one of the many helmets of that type depicted in the Morgan/Maciejowski Bible. A notable feature of helmet depictions from that period is the colour contrasts, which were probably arrived at by a variety of means. For the helmet shown, colour was added to the infill plates by covering them in plant-dyed linen cloth, supported by the evidence of fabric found between layers of an extant contemporary Norwegian iron hat. Some other possibilities would be heat colouration, painting, or metal leafing.